Which of the following is the CIDR notation for a network with the Subnet Mask of $255\mathrm{.}255\mathrm{.}255\mathrm{.}192?$

$1\mathrm{.}1\mathrm{.}1\mathrm{.}1/24$

$192\mathrm{.}168\mathrm{.}1\mathrm{.}0/24$

$255\mathrm{.}255\mathrm{.}255\mathrm{.}192/24$

$192\mathrm{.}168\mathrm{.}1\mathrm{.}0/26$