Three students were asked to rewrite the expression 28x^3 + 20x^5 using a common factor. The rewritten expression are in the table

Student A 4x3(4 + 9x2)
Student B 3x2(6x + 12x3)
Student C 9x3(2 + 4x2)

Part A: Did Student A rewrite the expression correctly using a common factor? Explain.

Part B: Did Student B rewrite the expression correctly using a common factor? Explain.

Part C: Did Student C rewrite the expression correctly using a common factor? Explain.

Part D: Rewrite the expression using a different common factor than what is shown in the table. Choose a common factor that includes a coefficient other than 1 and a variable. Show every step of your work.