The (b) and (c) are not really needed: early timesharing systems managed to launch processes straight from the punched card decks IIRC. And without (a), what do

The (b) and (c) are not really needed: early timesharing systems managed to launch processes straight from the punched card decks IIRC. And without (a), what do you even need the second, identical task for? I guess it could be used parallelize crunching the numbers, but that's it; and probably that should perhaps be done from the system operator layer anyway? Like, "launch 5 copies of program on this deck but mark one specific slot in memory different for them, so they would know their ID".