No physical slot is required for e-sim.
Therefore, all 3 can be used together at the same time.

No, only 1 SIM at a time.

In the operating instructions you can see an SD slot and a nano-sim slot, both of which are physical. As far as I know, the additional e-sim does not need a slot, so it should be possible,
e-sim, nano-sim and SD memory card all three together, or am I seeing this wrong?