I2C on NANO pins?

Projects Programming
1

I am having trouble with the NANO I2C Wire library. Right now I am running in circles. With the answers to the following 3 questions, I believe I can make progress.

Note: I am using a genuine Arduino Nano V3.0 and the standard Wire library.

I have found a document showing the I2C pins on Arduino NANO as A4 and A5 and another says they are D4 and D5.

Three questions:

  1. I need a definitive answer on where the I2C pins are located on the NANO
  2. I need to know if these pins need pullups
  3. Will the Wire library hang the NANO if the I2C slave is not attached?

Thanks

2

A4/A5
Yes
Yes

3

I love succinct answers... Thank you.