$4\mathrm{.}11$ What best describes a first usable IP address in a IPv$4$ address block?

Group of answer choices

All $1$ bits in the host portion of the addre

All $1$ bits plus a rightmost $0$ bit in the host portion of the address

All $0$ bits in the host portion of the address

All $0$ bits plus a rightmost $1$ bit in the host portion of the address