What is prohibited with respect to ROBOT entry?

The prohibition regarding ROBOT entry that is most relevant would be related to using multiple ROBOTS. In competitive robotics, particularly in events governed by specific rules such as those in FRC (FIRST Robotics Competition), each team is typically allowed to enter only one ROBOT per event. This is to ensure fairness and provide equal opportunities for all participating teams. Each ROBOT's design, programming, and performance are unique to its team, and allowing multiple ROBOTS from the same team could lead to an inequitable advantage.

The other mentioned scenarios, while they may pose issues or challenges during a match or competition, do not directly correspond to the rules governing ROBOT entry itself. For instance, modifying a ROBOT during matches is handled by separate regulations, usually emphasizing the need for ROBOT integrity throughout a match. Being late to the competition could affect a team's ability to participate but does not explicitly relate to the concept of entry. Sharing parts with other teams may raise ethical concerns or violate specific competition rules, but it is not directly tied to the entry process. Therefore, the most straightforward prohibition regarding ROBOT entry is indeed the use of multiple ROBOTS.