a) The bathtub failure rate model provides for both wear-in as well as wear-out failures.
b) The Weibull distribution is often used to model increasing, constant or decreasing failure rates.
c) Information regarding the failure characteristics of an item are important when selecting a appropriate maintenance policy.
 b and c
 a and c
 a and b
 a, b and c
 None of the above options (1, 2, 3, or 4) is correct.
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