In which sentence is all punctuation correct? This year’s triathlon will consist of: running ten miles, swimming one mile…

In which sentence is all punctuation correct? This year’s triathlon will consist of: running ten miles, swimming one mile and biking twelve miles. This years triathlon will consist of running ten miles, swimming one mile and biking twelve miles. This years’ triathlon will consist of running ten miles, swimming one mile and biking twelve miles. This year’s triathlon will consist of running ten miles, swimming one mile, and biking twelve miles.