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Select all the statements that are true.

Select $2$ correct answer$($s$)$

One of the demand options of aggregate planning is to vary the workforce by hiring or layoffs.

One motive for using demand$-$influencing aggregate planning options is to create uses for excess capacity within an organization.

In aggregate planning, the amount of overtime and the size of the work force are not adjustable elements of capacity.

The use of part$-$time workers as an aggregate planning option may be less costly than using full$-$time workers, but may also reduce quality levels.

Advertising and promotion are methods of manipulating product or service supply in aggregate planning.

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