Consider $3$ processes A$,$ B$,$ C$,$ to be scheduled as per SRTF algo. The Process $\text{'}$A$\text{'}$ is known to

be scheduled first & when $\text{'}$A$\text{'}$ has been running for $7$ units of time, then the process $\text{'}$C$$ has arrived.

Then process $\text{'}$B$\text{'}$ has arrived and Completed running in $2$ units time. Then what could be the

minimum burst time of process A & C $?$