Consider an old, traditional computer with $2,048$ bits of memory available for computation. Now consider a state$-$of$-$the$-$art quantum computer with $433$ qubits. Why can the quantum computer outperform the traditional computer?

Both a bit and a qubit can be $0$ and $1$ at the same time.

A qubit can only be $0$ or $1$ ; a bit can be $0$ and $1$ at the same time.

A bit can only be $0$ or $1$ ; a qubit can be $0$ and $1$ at the same time.

Both a bit and a qubit can only be $0$ or $1.$