If the registers $r1,r2$ and $r3$ contain the values $0,15$ and $12$ respectively, what will be the value in register $4$ after execution of the following code segment? Assume that the registers are $32$ bits in size.

MVN $x0,x1$

AND $,x4,x0,x2$

EOR $,x4,x4,x3$

a$.15$

b$.3$

c$.12$

d$.$ None of these.