A C expression to compute a * 19 (a times 19) is:
(Recall that one time shift to left doubles an integer. )
A. (a << 16) + (a << 3);
B. (a << 4) + (a << 1) + a;
C. (a << 4) + (a << 1) + 1;
D. (a << 4) + (a << 2) + a;