Universal Containers manages leads in a Lead qualification queue where sales reps can accept ownership...

The validation rule should be AND(ISNEW(), ISBLANK(Lead.Owner:User.Id)). This rule will prevent saving a new lead record if the owner is not a user. This will ensure that campaign members have a sales owner. Option A is incorrect because it will prevent saving any lead record if the owner is blank, which is not the requirement. Option B is incorrect because it will prevent saving an existing lead record if the owner is a queue, which is not the requirement. Option D is incorrect because it will prevent saving any lead record if the owner is a queue, which is not the requirement.