15. Suppose p is a pointer of node points to the rear of a circular linked list. Initially, p = null.The following programcodes will insert a node pointed by pointer q at the front of the circuler list. Please fill in the blanks.
(A) code1: p , code2: q
(B) code1: p , code2: q-＞link
(C) code1: p-＞link , code2: q
(D) code1: p-＞link , code2: q-＞link