If f(x) = (2x + 1)(2x + 3), complete the square and determine the minimum or maximum value of the function.
a) f(x) = 4(x + 14)^2 + 3 and f(x) has a maximum value f(−1/4) = 3.
b) f(x) = 4(x + 14)^2 + 3 and f(x) has a minimum value f(−1/4) = 3.
c) f(x) = 4(x + 1)^2 − 1 and f(x) has a maximum value f(−1) = −1.
d) f(x) = 4(x + 1)^2 − 1 and f(x) has a minimum value f(−1) = −1.