Please note that twin A/P autolands ie. Fail Operational allow the use of both Conf3 and FULL for autolands on all the variants A319,A320,A321
Twin APs? I don't think so.
The 757, for example, has L R and C = three channels, the minimum reqd for Cat 3.
Airbus has AP1 and AP2; both twin channel = four APs.
True.