A Quantum Computer Built from 4 Qubits

Multiple Choice

A quantum computer built from 4 qubits

A) must be in only one of its 16 possible quantum states.
B) can be in all 16 of its 16 possible quantum states, simultaneously.
C) must be in only one of its 4 possible quantum states.
D) can be in all 8 of its 8 possible quantum states, simultaneously.
E) can be in all 4 of its 4 possible quantum states, simultaneously.