Why Should Handpieces Be Heat Sterilized Rather Than Wiped Off

Why should handpieces be heat sterilized rather than wiped off with a disinfectant between patients?

A) Because wiping off the outside will cause the handpiece to rust
B) Because wiping off the outside will not kill the microbes that were retracted up inside the handpiece
C) Because wiping off the outside could allow some of the damaging disinfectant to get inside the handpiece and destroy it
D) Because heat sterilization will help the internal lubricant spread to all surfaces in the turbine chamber