Which of the following describes the group structure of the units U(16)U(16)U(16)?
Cyclic group C8C_8C8
Klein four-group V4V_4V4
C2×C4C_2 \times C_4C2×C4
C2×C2×C2C_2 \times C_2 \times C_2C2×C2×C2