Which sentences express proper parallelism below? Select all that apply.
Ian will have to bike, to run, and to swim for an extended time to compete in the triathlon.
To complete the triathlon, Ian will have to train at running, swimming, and biking.
The triathlon will require Ian to bike, run, and swim in order to compete.
Ian will have to train at running, to swim, and on a bike for the triathlon.