A uniform $12-$kg solid disk is suspended in an uniform gravitation field

$(9=9\mathrm{.}81$ m$/$s$*)$ from the point C by the two identical wires at A and B$,$

in such a way that both the wires are tangential to the disk at the points of attachment. If the wire at B suddenly breaks, $($a$)$ draw the FBD of the disk, and determine $($b$)$ the angular acceleration a of the disk and

$($c$)$ the tension T in the wire at A$,$ all at an instant just after the break occurs.