下面是求二叉树深度的算法 ,其中①处需要填写的内容是()。int Depth (BiTree T )if ( T!=NULL ) {depthLeft = Depth( T->lchild );depthRight= Depth( T->rchild );depthval =① ; }else depthval = 0;return depthval;}
A. 1+depthLeft+depthRight
B. 1+(depthLeft <depthRight ? depthLeft : depthRight)
C. 1 + (depthLeft > depthRight ? depthLeft : depthRight)
D. 1+max(depthLeft,depthRight)