The VP of Sales wants to require that the Next Step field is always updated when an opportunity stage is changed. How can this process be automated?

A. Create a validation rule with the following formula: AND( ISCHANGED(ISPICKVAL(StageName)), NOT( ISCHANGED(NextStep)))
B. Create a validation rule with the following formula: AND( ISCHANGED(StageName), NOT( ISCHANGED(NextStep)))
C. Create a workflow rule with the following formula: AND( ISCHANGED(StageName), NOT( ISCHANGED(NextStep))
D. Create a workflow rule with the following formula: AND( ISCHANGED(ISPICKVAL(StageName), ISCHANGED(NextStep))

Suggest answer: B

Reference: