3 crew normal FTL,
It just says total in flight rest of 3 hours and it doesn't specify only for operating crew. And the 3 hours rest is to be able to extend the FDP to either max of 18 or 15 hrs (depending on crc availability or not), if the planned duty is already inside the normal FDP then there is no real need to get the 3 hours rest.
The only part where it specifically says 3 hours for operating crew is in the burnout policy which, as stated earlier, is only on approved pairings (Lusaka-Harare being the only approved so far).