12 pts Question 4 One possible way to simplify cos x + cos' c . tan r is shown. Choose the correct substitution in each of the steps below. Simplify: cos' x + cos' r . tan' r Step 1: cos? r ( A + tan? x) where A = [ Select ] Step 2: cos I (B) Where B = [ Select ] Step 3: cos' I . G Where C = [ Select ] Step 4: D Where D = [ Select ]