Which of these represents an optimal portfolio comprised of two stocks? Select all that apply.

$14\mathrm{.}3$ percent return; $24\mathrm{.}8$ percent standard deviation

$14\mathrm{.}2$ percent return; $24\mathrm{.}8$ percent standard deviation

$14\mathrm{.}8$ percent return; $25\mathrm{.}4$ percent standard deviation

$14\mathrm{.}9$ percent return; $25\mathrm{.}4$ percent standard deviation