What will happen if Buffer $1$ and Buffer $2$ are enabled at the same time?

a$)$ Mem$1$ will be cleared

b$)$ The data bus will change from floating to $+5V$

c$)$ Mem$1$ will store the data value $0$ on the next active clock pulse

d$)$ A short circuit will occur

e$)$ Mem $2$ will store the data value $1$ on the next active clock pulse