Heather$$ Adams, production manager for a Colorado exercise equipment$$ manufacturer, needs to schedule an order for $50$ UltimaSteppers, which are to be shipped in week $.$ Subscripts indicate quantity required for each arent. Assume$$ lot$-$for$-$lot ordering.

$.$

The product structure is as follows:

b$)$ Choose the correct time$-$phased structure.

c$)$ Develop a net material requirements plan for $F($enter your responses as whole numbers$).$