This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
I am afraid that you're question is the answer. It can't also be simplified. But if you really want the answer to be given to you I hope that it is to no surprise that the answer is a-3.

1 5 1