What validation rule should an app builder configure?

Universal Containers manages leads in a Lead qualification queue where sales reps can accept ownership of the Lead. Campaign members are required to have a sales owner.

What validation rule should an app builder configure?
A . AND( ISBLANK(Lead.Owner.Id) )
B. NOT(ISNEW() && ISBLANK(Lead.Owner:Queue.Id))
C. AND(ISNEW(), ISBLANK(Lead.Owner:User.Id))
D. NOT( ISBLANK(Lead.Owner:Queue.Id))

View Answer

Answer: D