Which address$($es$)$ could be the last address of a block of $64$ classless IPv$4$ addresses?

Question $14$ options:

$21\mathrm{.}83\mathrm{.}105\mathrm{.}31/27$

$21\mathrm{.}83\mathrm{.}105\mathrm{.}31/26$ only

$35\mathrm{.}11\mathrm{.}8\mathrm{.}63/26$ and $44\mathrm{.}33\mathrm{.}22\mathrm{.}127/26$

$35\mathrm{.}11\mathrm{.}8\mathrm{.}63/26$ only

$35\mathrm{.}11\mathrm{.}8\mathrm{.}63/27$

none of the given choices

$35\mathrm{.}11\mathrm{.}8\mathrm{.}63/6$ and $44\mathrm{.}33\mathrm{.}22\mathrm{.}127/6$

$35\mathrm{.}11\mathrm{.}8\mathrm{.}63/6$ only

all of the given choices

$21\mathrm{.}83\mathrm{.}105\mathrm{.}31/6$ only

$44\mathrm{.}33\mathrm{.}22\mathrm{.}127/6$ only

$44\mathrm{.}33\mathrm{.}22\mathrm{.}127/26$ only