Which of the following sentences contains a comma splice?
Heather loves traveling with her best friends Robin and Brett, they have seen their favorite band at least 15 times together.
Heather loves traveling with her best friends Robin and Brett; they have seen their favorite band at least 15 times together.
Heather loves traveling with her best friends Robin and Brett: they have seen their favorite band at least 15 times together.
Heather loves traveling with her best friends, Robin and Brett. They have seen their favorite band at least 15 times together.