Give examples of languages L1 and L2 over that satisfy the following descriptions. [2 Points] L1 is regular, L2 is nonregular, and L1 L2 is regular. [2 Points] L1 is regular, L2 is nonregular, and L1 L2 is nonregular. [2 Points] L1 is regular, L2 is nonregular, and L1 L2 is regular. [2 Points] L1 is nonregular, L2 is nonregular, and L1 L2 is regular.

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