Which brake should you use while opening the throttle slightly while going uphill?

• Change to the rear brake to hold the motorcycle while opening the throttle slightly with your right hand
• Change to the front brake to hold the motorcycle while opening the throttle slightly with your right hand
• Change to the foot brake to hold the motorcycle while opening the throttle slightly with your right hand
  Explanation:

  "Change to the foot brake to hold the motorcycle while opening the throttle slightly with your right hand"
• All of the above