The rule for becoming a lobbyist if one has been a U.S. Senator is:

Group of answer choices

According to the Open Government Act of 2007, one must wait 2 years after leaving the Senate

According to the Open Government Act, one must wait 3 years after leaving the Senate

According to the Open Government Act, a Senator can become a lobbyist at any time after leaving office.

One cannot become a lobbyist if, while in the Senate, one was on a committee supervising a specific industry. All other options are available immediately after leaving the Senate according to the Open Government Act of 2007.