When multiple objects require the same picklist values, the correct approach is to create a Global Picklist Value Set (also called a Global Value Set). This allows an organization to maintain one centralized list of picklist values that can be reused across multiple picklist fields on different objects.

Why C is correct:Exact Extract:''Global value sets let you share the same picklist values with more than one picklist field. A global value set is a set of shared values that you define once and use in multiple custom picklist fields.'' --- Salesforce Help | Global Value SetsThis ensures consistent data values, simplifies maintenance, and makes changes automatically available wherever the global picklist is used.

Why C is correct:Exact Extract:''Global value sets let you share the same picklist values with more than one picklist field. A global value set is a set of shared values that you define once and use in multiple custom picklist fields.'' --- Salesforce Help | Global Value SetsThis ensures consistent data values, simplifies maintenance, and makes changes automatically available wherever the global picklist is used.

Why not A (Related Picklist):''Related Picklist'' is not a valid Salesforce feature.

Why not B (Shared Custom Field):Salesforce does not provide a ''Shared Custom Field'' functionality. Each field belongs to a specific object.

Why not D (Dependent Picklist):Dependent picklists control available values based on another field's value. They do not allow reuse of a single value list across multiple objects.

Reference (Salesforce Platform App Builder documentation / Study Guide topics):

Salesforce Help | Global Value Sets

Salesforce Help | Picklist Fields

Salesforce Platform App Builder Exam Guide | Data Modeling and Management