For the given gravity retaining structure and soil conditions shown below: $\backslash$table$[[,,$Drained parameters,Undrained parameters$],[$Soil$,\backslash$gamma $($pcf$),\backslash$phi $^(\text{'})(\backslash$deg $),$c$^(\text{'})($psf$),\backslash$phi $(\backslash$deg $),$s$\_($u$)($psf$)],[$Backfill$,120,38,0,-,-],[$Clayey Silt,$110,20,1400,8,1000],[$Silty Clay,$120,14,800,0,3500]]$

Note: Define carefully the way you will treat the water table in the backfill.

$($a$)$ What are the factors of safety against overturning, sliding, and bearing capacity failure?

$($b$)$ Is this wall well$-$proportioned? Explain your answer.

$($c$)$ What other factors should be considered prior to accepting this geometry as final design configuration?