In a C$++$ program, what is purpose of line y and line z$?$

Line x: int a $=15$;

Lind y: int $*$p;

Line z: p $=$ &a;

Group of answer choices

create a pointer and assign the address of of a to the variable p

create a pointer and assign the integer $15$ to the variable a

create a pointer and assign the integer $15$ to the variable p

create a pointer and assign the value of a to p