In the tower of Hanoi $x , y , z$ are the positions and we are to move 10 disks from $x$ to $y$. What are the $128$th and $768$th moves ?
(A) $x\rightarrow y$ and $x\rightarrow z$
(B) $x\rightarrow z$ and $z\rightarrow x$
(C) $x\rightarrow z$ and $z\rightarrow y$
(D) $x\rightarrow y$ and $z\rightarrow y$