A Universal Shift Register, USR, is connected as shown. $S_{1}=1, S_{0}=1$ select the load operation. Initially $\mathrm{Q}_{3} \mathrm{Q}_{2} \mathrm{Q}_{1} \mathrm{Q}_{0}=1010 $ After 1 clock : W) $\mathrm{Q}_{3} \mathrm{Q}_{2} \mathrm{Q}_{1} \mathrm{Q}_{0}=0000$ X) $\mathrm{Q}_{3} \mathrm{Q}_{2} \mathrm{Q}_{1} \mathrm{Q}_{0}=1010$ Y) $Q_{3} Q_{2} Q_{1} Q_{0}=0101$ Z) $\mathrm{Q}_{3} \mathrm{Q}_{2} \mathrm{Q}_{1} \mathrm{Q}_{0}=1111$ Select one: a. $z $ b. $Y$ c. W a. $x$ CS.VS.958