If you are located in the bottom row of a standard QWERTY keyboard and you use your right pinky finger (R1) to key your letter, the correct answer is:
I am the "back slash" key.
The backslash key is typically positioned to the right of the "Z" key and often requires the use of the right pinky finger to press it. The other keys listed (comma, period, and less than symbol) are not associated with the right pinky finger in the standard keyboard layout.