The correct answer is A. T/369(3b).
T/369(3b) is the authority that allows a train to pass an IBS that is defective. The authority must be issued by the SM (Station Master) and must include the private number of the next station to pass the IBS.
T/369(2B) is the authority that allows a train to pass an IBS that is working. This authority does not require a private number to be included.
T/369(4b) is the authority that allows a train to pass an IBS that is working and has a speed restriction. This authority requires the speed restriction to be included in the authority.
T/369(5b) is the authority that allows a train to pass an IBS that is working and has a speed restriction and a private number. This authority requires both the speed restriction and the private number to be included in the authority.
In this case, the IBS is defective and the advanced starter is working. Therefore, the SM must issue T/369(3b) authority with the private number of the next station to pass the IBS.