Which filter would capture only traffic from the host $10\mathrm{.}1\mathrm{.}1\mathrm{.}31?$

ip$.$source$=10\mathrm{.}1\mathrm{.}1\mathrm{.}31$

ip$.$src$==10\mathrm{.}1\mathrm{.}1\mathrm{.}31$

ipaddress.source$==10\mathrm{.}1\mathrm{.}1\mathrm{.}31$

ip$.$src$.$host$=10\mathrm{.}1\mathrm{.}1\mathrm{.}31$