When a vehicle is stopped on the right side of the roadway...

Correct answer: the driver may get in or out on the left side, but quickly and cautiously.

The driver sits on the left, so they may get in and out through their own door even when the car is stopped along the right edge. They must do so quickly and carefully, checking before opening the door that no one is approaching, especially cyclists. Getting out on the side closest to the edge of the road is the general rule, which is why the answers saying "never" and "always" are wrong.

Real Decreto 1428/2003, de 21 de noviembre, por el que se aprueba el Reglamento General de Circulación · Abrir la puerta a la holandesa y otros consejos para compartir la vía con ciclistas y patinetes