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How can covariance be achieved with generics?

Using bounded wildcards

By using bounded wildcards, covariance can be achieved in generics. This allows for a specific type to be specified as the upper bound for the wildcard, allowing for the generic to only accept objects of that type or its subclasses. This allows for more flexibility and type safety when dealing with generic types. Options B and C are incorrect because they do not directly address the concept of covariance in generics. Option D is incorrect because it is possible to achieve covariance through bounded wildcards, making it a valid option.

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By directly casting List types

Through generic method arguments

Covariance is not possible with generics

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