Refer to the diagram above for this question.

The flip$-$flop FF$2$ has a setup time requirement of $150$ psec.

The clock tree buffers between point A and $B$ have a total delay of $300$ psec.

The combinatorial block between point $C$ and $D$ has a total delay of $1\mathrm{.}5$ nsec$.$

If the positive clock edge is launched from point $A$ at time $T=2nsec,$ what is the latest time the data

must be available at point C $($the output of FF$1),$ in order to meet the setup time of FF$2.$

$T=150$psec

$T=650$ psec

$T=800$psec

T$=900$psec