If Ham Is Sliced on the Same Slicing Machine Used

If ham is sliced on the same slicing machine used to slice cheese,this could put children at risk due to which of the following reasons?

A) If they are allergic to milk,the foods are now cross-contaminated.
B) Ham is more likely to be a food contaminate than cheese.
C) The likelihood of ham and cheese becoming contaminated increases when they are sliced on the same machine.
D) Dangerous bacteria can live on ham but not cheese.