What activities are exclusive to gta online versus story mode?

The verified evidence from Wikipedia describes Grand Theft Auto V's single-player story mode, detailing its three protagonists and open-world setting in San Andreas. However, the source does not mention GTA Online or any activities unique to the multiplayer mode. Without additional evidence specifically addressing GTA Online's features or exclusive gameplay elements, no accurate comparison can be made between the two modes based on the provided information. The distinction between single-player and online-exclusive activities would require further verified sources.