Read the passage: 'Military fitness standards require all active-duty personnel to pass a physical fitness test twice each year. The test measures cardiovascular endurance, muscular strength, and flexibility. Soldiers who fail any component of the test must complete a remedial fitness program and retest within 90 days. Repeated failures can result in administrative action.' According to the passage, how often must active-duty soldiers take a fitness test?
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A
Once a year
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B
Twice a year
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C
Every 90 days
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D
Every three months