Which sentence uses commas in a series correctly?
O
The study includes a local, high school, a junior college a trade school, and a state
university.
O
The study, includes a local high school a junior college, a trade school, and a state
university.
O
The study includes, a local high school, a junior college, a trade school and a state
university.
The study includes a local high school, a junior college, a trade school, and a state
university.