Which of the Following Can You Use to Fund a Roth

Which of the following can you use to fund a Roth IRA?

A) Writing a check and mailing it to the financial institution.
B) Initiating an electronic payment to the investment company from your financial institution (i.e., bill pay, wire transfer, etc.) .
C) Authorizing the investment company to pull the money out of your bank account.
D) All of these answer choices are correct.