Compare the light$-$gathering power and the theoretical angular resolution $($in arcseconds at $500$

nm$)$ for:

$($a$)$ the $10-$m Keck telescope,

$($b$)$ the $3\mathrm{.}5-$m telescope at Apache Point Observatory,

$($c$)$ the combination of two $1\mathrm{.}0-$m telescopes in the CHARA array with the longest baseline

separation $(330$ m$)$