ACT Car DKT - You buy a car and find that the spare tyre is smooth; the tread is only just visible. If you get a puncture will it be legal to drive the car with a smooth spare tyre?

No, it's illegal to drive a car with a smooth tyre even if it is the spare.

Yes, but you must get the puncture fixed within 24 hours.

Yes, if the tyre is correctly inflated and the side walls of the tyre are in good condition.

(9/376) You buy a car and find that the spare tyre is smooth; the tread is only just visible. If you get a puncture will it be legal to drive the car with a smooth spare tyre?