A company uses sampling inspection to inspect parts that are sent to their customers. If a lot of parts is rejected from sampling inspection, it is inspected 100% and the rejected parts are sent back to the manufac- turing department for rework or scrap. What happens to the overall outgoing quality level as the number of defective parts increases?

a. The overall outgoing quality level decreases at first and then increases.

b. The overall outgoing quality level increases at first and then decreases.

c. The overall outgoing quality level decreases.

d. The overall outgoing quality level increases.