The position of equilibrium

Question

Z1) is never reached in an irreversible process.
Z2) is always reached in a reversible process.
Z3) is the same for pure reactants or pure products as starting materials.

1. Z3) only.
2. Z2) only.
3. Z1) and Z2) only.
4. Z1) and Z3) only.
5. Z1) only.

Answer 1

I don't think there is any process that is irreversible so I discard #1.
#2 is true.
#3 doesn't make sense to me. I don't know what it says.
Therefore, I would go with #2 only.

Answer 2

4.Z1) and Z3) only