Which vaccination schedule is generally recommended for puppies to establish protective immunity?

Which vaccination schedule is generally recommended for puppies to establish protective immunity?

• A. A series of core vaccines starting at ~6-8 weeks with boosters every 3-4 weeks until ~16 weeks, plus adult boosters.
• B. A single core vaccine at 12 weeks
• C. Vaccines only once at 1 year
• D. No vaccines until 6 months

Answer: (A)