The following tableau represents a specific simplex iteration. All variables are nonnegative. The tableau is not optimal for maximization problem. Thus, when a nonbasic variable enters the solution it can increase z. Which of the following entering and leaving variable to produce new basic solution. Basic Solution S2 84 1 -5 -4 4. 24 52 2. 6. -1 0 S4 1 0. Select one: O a. X as entering variable and sa as leaving variable O b. X2 as entering variable and s, as leaving variable O c. X2 as entering variable and sg as leaving variable O d. X, as entering variable and sz as leaving variable O e. X, as entering variable and s; as leaving variable 000-0