Write a function rule for the table.
c = 12d + 22
c = 22d + 22
c = 22d
c = 22d + 12

If x^2+mc+m is a perfect square trinomial, which equation must be true? a) x^2+mx+m= (x-1)^2 b) x^2+mx+m= (x+1)^2 c) x^2+mx+m= (x+2)^2 d) x^2+mx+m= (x+4)^2