Complete the square for the expression. write the resulting expression as a binomial squared.
x^2 + 4x +
a. x^2 + 4x + 4 = (x + 4)^2
b. x^2 + 4x + 16 = (x + 2)^2
c. x^2 + 4x + 4 = (x + 2)^2
d. x^2 + 4x + 16 = (x + 4)^2

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