Code Q$5$A represents assembly language code for a pair of processes that share the variable

result. The initial value of the result before execution of either process begins is $10.$ Here,LD loads

the memory variable into the target register, the ADD instruction adds values, and ST stores the

register value into the memory variable. If processes X and Y are run on a timesharing system,

there are six possible orders in which the LD and ST instructions might be executed. For each of

the orders, the final value of the counter variable could be $11,12,$ or $13.$ i$)$ Add semaphores $($with

initial values$)$ so that the final value of the counter is $12.$ ii$)$ Add semaphores $($with initial values$),$ so

that the final value of the counter is not $13.$ iii$)$ Add semaphores $($with initial values$),$ so that process

X executes only after the execution of process $2.$