How should I demonstrate a choice between two options in step-by-step instructions?

I'm writing a step-by-step employee guide for logging into a course management program. I need to demonstrate that one of the steps will differ depending on where the employee is logging in from.

To clarify, this is a written document which will be printed and distributed among employees, so a digital wizard or selection menu isn't an option.

I've come up with a few different options for displaying this information. Which one should I use to convey a choice between two options?

List both options as a single step

  1. Go to employee website.
  2. If using a personal work computer: Click 'BUTTON A'
    If using a shared computer: Click 'BUTTON B'

List both options as two steps

  1. Go to employee website.
  2. If using a personal work computer: Click 'BUTTON A'
  3. If using a shared computer: Click 'BUTTON B'

List both options as sub-bullets

  1. Go to employee website.
  2. Login with one of the following two methods.
    • If using a personal work computer: Click 'BUTTON A'
    • If using a shared computer: Click 'BUTTON B'
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