Bad Qubits — Learn Quantum by Doing

Multiple choice

The lesson presents the five-qubit code, denoted [[5,1,3]]. What does this code achieve that no smaller code can?

It is the smallest possible code that corrects an arbitrary single-qubit error; no four-qubit code can
It corrects arbitrary two-qubit errors using just five qubits
It is the only code that needs no syndrome measurement at all
It is a CSS code with fully transversal logical gates