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Mark is fifty$-$five and works for Acme, Inc., a large international corporation. Acme dismisses Mark, and he sues Acme alleging age discrimination. Which of the following must Mark prove to establish a prima facie case of unlawful age discrimination under the ADEA:

Select one:

a$.$ He was discharged under circumstances that give rise to an inference of discrimination.

b$.$ The person Acme hired to replace him was qualified for the position.

c$.$ Both a and b$.$

d$.$ Neither a nor b$.$