Standard picklists can be the controlling field but not the dependent in a field dependency:
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A. B.A.
The answer is true. In Salesforce, a field dependency is a way to create a hierarchical relationship between two fields. When the value of a controlling field changes, it determines which values are available in the dependent field.
Standard picklists can be the controlling field, but they cannot be the dependent field in a field dependency. This is because standard picklists are predefined and cannot be customized to change their values based on the value of another field.
For example, if you have a custom object called "Opportunity" with two standard picklist fields called "Stage" and "Probability," you could create a field dependency where the "Stage" field is the controlling field and the "Probability" field is the dependent field.
When a user selects a value for the "Stage" field, it will determine which values are available in the "Probability" field. However, you cannot create a field dependency where the "Probability" field is the controlling field because it is a standard picklist and its values are predefined.
To create a field dependency where the dependent field is a picklist, you must create a custom picklist field. Custom picklist fields can be both the controlling and dependent fields in a field dependency.