If triangle ABC is dilated by a factor of 4 to produce triangle A'B'C', what is the length of A'C' (a'c') after the dilation? What is the measure of angle A' (m∠a')?
a) a'c' = 5/3, m∠a' = 37°
b) a'c' = 20, m∠a' = 37°
c) a'c' = 20, m∠a' = 148°
d) a'c' = 12, m∠a' = 53°