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MongoDB C100DBA Exam - Topic 1 Question 127 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 127
Topic #: 1

[All C100DBA Questions]

Which of the following are valid json documents? Select all that apply.

A{'a':l, 'b':{'b':l, 'c':'foo', 'd':'bar', 'e':[l,2,4]}}

B{'city':'New York', 'population', 7999034, boros:{'queens', 'manhattan', 'staten island', 'the bronx', u 'brooklyn'}}

C{'name':'Fred Flintstone';'occupation':'Miner';'wife':'Wilma'}

D{ }

Show Suggested Answer

Suggested Answer: A, D

by Gracia at May 07, 2026, 08:28 PM

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Jess

7 hours ago

B is totally wrong, missing colons!

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Raina

5 days ago

A has errors, "l" should be a valid value.

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Elvera

11 days ago

D is valid, it's an empty object!

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Carin

16 days ago

B has some syntax errors too, like the commas and missing quotes around keys. I feel like only D is safe here.

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Cristina

2 months ago

I'm not sure about A; I think the "l" should be a number or a string, but I can't recall exactly.

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Aja

2 months ago

I practiced a similar question, and I think D is definitely valid since it's an empty object.

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Kimberlie

2 months ago

I remember that JSON keys need to be in double quotes, so I think A and B might have issues.

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