A.node*p=head-〉next;while(p&&p-〉info!=x)p=p-〉next;if(p-〉info==x)returnp;elsereturnNULL;
B.node*p=head;while(p&&p-〉info!=x)p=p-〉next;returnp;
C.node*p=head-〉next;while(p&&p-〉info!=x)p=p-〉next;returnp;
D.node*p=head;while(p-〉info!=x)p=p-〉next;returnp;
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