Given the block of address space defined by $10\mathrm{.}234\mathrm{.}0\mathrm{.}0/16,$ what is the IP address and subnet mask of the smallest subnet that can support $340$ network interfaces, among the following subnets?

$10\mathrm{.}234.\frac{212\mathrm{.}255}{23}$

$10\mathrm{.}234.\frac{0\mathrm{.}0}{25}$

$10\mathrm{.}234.\frac{128\mathrm{.}0}{17}$

$10\mathrm{.}234\mathrm{.}0\mathrm{.}0/23$