Hi. i'm studying and there is just one question i am not sure of the answer of on my study guide. i believe it is either a or c but i'm unsure and wanted a second opinion. you! in regards to rabies re-vaccination recommendations: a) the manufacturer's recommendations should always be followed. b) the veterinarian makes the decision regarding the frequency of re-vaccination depending on the species c) state law dictates the frequency of re-vaccination d) the rule of thumb is every 6 months for the animal's first two years of life