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Salesforce MCE-Dev-201 Exam - Topic 5 Question 13 Discussion

Certification Aid sends an email to a newly imported List with Subscribers who have no associated Subscriber Key. Which value will become the Contact Key? Choose 1.
B) Email address
A) ContactID
C) Subscriber ID
D) Unique random number

Salesforce MCE-Dev-201 Exam - Topic 5 Question 13 Discussion

Actual exam question for Salesforce's MCE-Dev-201 exam
Question #: 13
Topic #: 5
[All MCE-Dev-201 Questions]

Certification Aid sends an email to a newly imported List with Subscribers who have no associated Subscriber Key. Which value will become the Contact Key? Choose 1.

Show Suggested Answer Hide Answer
Suggested Answer: B

When an email is sent to a list where subscribers have no associated Subscriber Key, Marketing Cloud will use the Email Address as the Contact Key by default. This ensures that each subscriber can still be uniquely identified even if they do not have a predefined Subscriber Key.

: Salesforce Subscriber Key Concepts


by Essie at Jun 17, 2026, 06:43 PM

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Gearldine
3 days ago
True, but ContactID is often used in databases.
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Matthew
8 days ago
But email is usually the primary identifier.
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Dean
13 days ago
What about D) Unique random number? Could be a safe choice.
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Gearldine
18 days ago
I disagree. A) ContactID seems more logical.
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Matthew
23 days ago
I think it's B) Email address. Makes sense, right?
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Becky
29 days ago
I agree, B) Email address makes the most sense!
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Kanisha
1 month ago
A) ContactID seems more logical to me.
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Titus
1 month ago
Wait, is it really just the email? Sounds too simple.
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Leah
1 month ago
Definitely B) Email address!
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Beth
2 months ago
I think it's B) Email address.
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Shawna
2 months ago
I practiced a question like this before, and I think it was about using the ContactID, but I can't recall the details.
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Jonell
2 months ago
I feel like it could be a unique random number, but that seems less likely for a contact key.
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Virgilio
2 months ago
I'm not entirely sure, but I remember something about Subscriber ID being used in similar scenarios.
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Afton
2 months ago
I think the Contact Key might default to the Email address since it's the most common identifier for subscribers.
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