Indicate which type of shift is used for each variable in the following C code:

int a$,$ b;

unsigned int c;

$...$

a $=$ a $<<4$

b $=$ b $>>1$

c $=$ c $>>2$

a: Arithmetic shift right, logical shift left, or logical shift right? Choose one.

b: Arithmetic shift right, logical shift left, or logical shift right? Choose one.

c: Arithmetic shift right, logical shift left, or logical shift right? Choose one.