What must the driver of an oversized vehicle do to make it easier to be overtaken?

What must the driver of an oversized vehicle do to make it easier to be overtaken?
A)Nothing, the responsibility in an overtaking manoeuvre always lies with the overtaking driver.
B)Stop on the hard shoulder without exception.
C)Reduce speed or pull over to the hard shoulder if practicable.Correct
Drivers of heavy vehicles, oversized vehicles or those required to observe a specific speed limit who cannot keep to the right, but who can nevertheless be overtaken safely, must indicate this by moving their arm from back to front or by activating the right indicator. They must also slow down or pull over to the hard shoulder as soon as possible, if practicable, to facilitate overtaking and give way to those following them, when the density of oncoming traffic, the insufficient width of the carriageway, its profile or condition do not allow them to be overtaken easily and without danger.