If a process has a mean time to failure $($MTTF$)$ of $500$ hours and a mean time to repair $($MTTR$)$ of $50$ hours, what is the process's approx. availability $($in percentage$)?$ Hint: Availability $(\%)-$ MTTF $/($MTTF $+$ MTTR$)100$Page $3$:$3$Page $4$:$4$A$)10\%$B$)50\%$C$)90\%$D$)95\%$