Conditions That Can Cause Temperature "Overshoot" with Servo-Controlled Heated Humidifiers

Conditions that can cause temperature "overshoot" with servo-controlled heated humidifiers include which of the following?
1) The unit is allowed to warm up without flow.
2) Flow is decreased during normal operation.
3) The airway temperature probe becomes dislodged.
4) The unit reservoir is refilled with sterile water.

A) 1 and 3 only
B) 1, 2, and 3 only
C) 3 and 4 only
D) 2, 3, and 4 only