Which sentence uses commas correctly?


Soon we will encounter robots at, grocery stores at, the bank at, home and at, work.

Soon, we will encounter robots, at grocery stores, at the bank, at home and at work.

Soon we will encounter robots at grocery stores, at the bank, at home, and at work.

Soon we will encounter robots at grocery stores, at the bank at home, and at work.

Soon we will encounter robots at grocery stores, at the bank, at home, and at work.