How did Song policy address frontier defense and taxation for urban centers?

• A. Fortified garrisons and paid troops; a centralized bureaucratic system funded by taxes and duties.
• B. Decentralized feudal levies with no urban taxes; private militias funded by merchants.
• C. Religious charities funded frontier defense; no taxes used.
• D. Heavy reliance on foreign loans to fund defenses; no urban taxation

Answer: (A)