A and C are correct ,

D is not correct because there no checkbox labelled "Choose only one value" in the field setup !!!

@Phil there is no option ""Choose only one value" checkbox on picklist field.

A and C are correct

C AND D!!!

Explanation:

Multi-select picklist fields allow users to select more than one value from a predefined list of values. To prevent users from selecting more than one value, the administrator should change the field type from a multi-select picklist field to a picklist field.

Once the field type is changed, the administrator should select the "Choose only one value" checkbox on the picklist field. This option will force users to choose only one value from the picklist.

There is no need to backup the Shoe Style values in existing records, as changing the field type will not affect the existing values. Also, there is no need to reactivate the appropriate Shoe Style values after the field type changes as the values will remain the same, and the appropriate value will be selected from the picklist.

Changing datatype from multipicklist to piscklist will cause you to lose all existing data in this field. So must backup first.

A&C ARE CORRECT

A, C are correct

It's A & C, for sure