Using the recommendations from this section, which would be the best way for Tina to rephrase the following sentence from her speech about recommendations for police reform: $"$If a policeman has the right training, he is less likely to use violence."

a$.$ If a police officer has the right training, he is less likely to use violence."

b$.$ If police officers have the right training, they are less likely to use violence."

c$.$ If a police officer has the right training, he or she is less likely to use violence."

d$.$ If a policeman has the right training, they are less likely to use violence."