Is it permissible to continue landing rollout on a displaced threshold?

Landing rollout on a displaced threshold is permissible because a displaced threshold indicates that aircraft can use that portion of the runway for landing operations. Displaced thresholds are often marked on runways to designate an area where aircraft can safely land, even if taxiing or takeoff operations are not permitted from that segment.

In practice, once an aircraft lands beyond the displaced threshold and rolls out onto the designated portion of the runway, it is considered acceptable as long as the runway conditions allow for safe operation. It is essential for pilots to be aware of the runway markings and any local procedures that apply, but generally, landing on and rolling out past a displaced threshold is routinely accepted based on the design and maintenance of the airport runway.

The other options assume conditions or restrictions that don't align with standard aviation regulations or practices regarding displaced thresholds. The key concept is understanding that these markings are specifically intended to allow for safe landing operations in marked areas.