Suppose the switch S has been closed sufficiently long time for the capacitor to become fully charged $\left(where{R}_1=12k\Omega ,R_2=15k\Omega ,R_3=5k\Omega \right)$ which of the following options are correct

In steady state , the charge on the capacitors is $50\mu C$

In steady state , the charge on the capacitors is $90\mu C$

The time is taken for the charge on capacitor to fall to half its initial value 0.1386s

The time is taken for the charge on capacitor to fall to half its initial value 0.693s