You arrive to an intersection with traffic

How do we use the sumif formula (when dealing with different formats) ?

An npn transistor is correctly biased and turned on if the a. base is negative. b. collector is negative. c. collector is positive with respect to the emitter and negative with respect to the base. d. collector is the most positive lead followed by the base.

This isn't about school but every time it tells me to watch an ad to unlock the answer to a question it prompts a survey and it just keeps loading. so i haven't been able to get answers for my tests in like a week.