Consider the following statements:
1. Preparation of master production schedule is an iterative process
2. Schedule charts are made with .respect to jobs while load charts are made with respect to machines
3. MRP is done before master production scheduling
Which of the statements given above are correct?
(a) 1, 2 and 3 (b) 1 and 2
(c) 2 and 3 (d) 1 and 3