Which sentence choice below fixes the comma splice error in the following sentence?

Passing ENG002 takes discipline, the pacing of the course is so fast.


1. Passing ENG002 takes discipline: the pacing of the course is so fast!


2. Passing ENG002 takes discipline because the pacing of the course is so fast!


3. Passing ENG002 takes discipline; and the pacing of the course is so fast!


4. Passing ENG002 takes discipline and the pacing of the course is so fast!