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Final answer:An individual must complete d. 16 years of service to be eligible to wear four service stripes, with each stripe often representing four years of service.Explanation:The question appears to be related to the eligibility criteria for wearing service stripes in a military context. A service stripe, often referred to as a hash mark, is awarded for a certain period of permanent service, typically indicating the number of years served.In this context, eligibility for wearing four service stripes typically signifies a length of service which amounts to 16 years, with each stripe commonly representing four years of service. Therefore, the correct choice from the options provided is: d. 16 years....