Which command would result in safely detaching a disk or disks from a mirrored pool to create another identical pool?

Which command would result in safely detaching a disk or disks from a mirrored pool to
create another identical pool?

A.
zpool detach tank clt0d0

B.
zfs split tank1 tank2

C.
zpool create tank mirror clt0d0 c2t0d0

D.
zpool split tank1 tank2