What is the value in a after the following instructions execute?

Initial values:

a $=0$

b $=4$

c $=1$

d $=4$

e $=3$

ADD a$,$ b$,$ c

ADD a$,$ a$,$ d

ADD a$,$ a$,$ e

What is the value in a after the following instructions execute?

Initial values:

a $=0$

b $=4$

c $=1$

d $=4$

e $=3$

ADD a$,$ b$,$ c

ADD a$,$ a$,$ d

ADD a$,$ a$,$ e

$12$

$0$

$9$

$15$