Assuming X and Y are the two control variables, the following are the constraints laid out for maximizing the profit: Maximize profit (P) =8X+5Y subject to Constraint 1: 2X+ Y 
1000
Constraint 2 :3X + 4Y $\leq$2400
Constraint 3:X + Y $\leq$ 800
Constraint 4 :X - Y $\leq$350
Constraint 5:X $\geq$ 0
Constraint 6 :Y $\geq$ 0
Which of the above constraints is a redundant one and does not have any effect on the solution?
(a) Constraint-1
(b) Constraint-3
(c) Constraint-4
(d) Constraint-5 and Constraint-6