4. write a statement involving a pointer expression using the variables in this program which is ILLEGAL given your declared types. main) fint a, b, c; a=1; b = 2; c = 3; rc = &c; ra = rb ; rra &rb; rc = *rra; rrc = rra; rc = &a; rb = &c; *ra = 4; *rb = *ra + 5; printf ("%d %d %d " , a,b,c); printf ("%d %d ", *ra, *rb); printf ("%d %d %d ",**rra, **rrb, **rrc)