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1.

What is the key feature of entangled qubits in quantum mechanics?

The states of entangled qubits can't be described independently but only as a whole system. Thus, when you measure one qubit, it affects the state of the other qubit, no matter how far apart they are.

Entangled qubits don't share any information.

The states of entangled qubits can be described independently. Thus, when you measure one qubit, it doesn't affect the state of the other qubit.

2.

What is the role of the CNOT operation in creating quantum entanglement?

It flips the state of the second qubit (the target qubit) if, and only if, the state of the first qubit (the control qubit) is $\ket{1}$.

It flips the state of both qubits regardless of their initial states.

It flips the state of the first qubit (the control qubit) if and only if the state of the second qubit (the target qubit) is $\ket{1}$.

3.

What is the role of classical communication in the quantum teleportation protocol?

It allows the teleportation of information faster than the speed of light.

It's used to physically move the qubit from one location to another.

It's used by the sender to communicate the results of their measurements to the receiver. By doing so, the receiver can apply the necessary operations to the qubit they have to recreate the message qubit.

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