A certain product has the following bill of materials. Note that the number in parentheses refers to the number of respective items needed in the assembly process.

Bill of materials showing items needed in the assembly process.The number in parentheses indicates the number of items needed: A$,$ B$(3),$ C$(2),$ D$(4).$

The master production schedule for A for the next $6$ weeks is shown below.

Weeks $111213141516$

Master production schedule $252424212122$