A. IF(NOT(ISBLANK(Nickname__c)),Nickname__c,FirstName)
B. IF(TEXT(Nickname__c),Nickname__c,FirstName)
C. IF(ISNULL(Nickname_c),Nickname_c,FirstName)
D. IF(NOT(BLANKVALUE(Nickname__c)),Nickname__c,FirstName)

Suggest answer: A

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