The inheritable form of immunity through mother's milk is:

Explanation

Passive immunity refers to the transfer of antibodies from one individual to another, providing immediate but temporary protection. In the context of mother's milk, antibodies are passed from the mother to the infant, offering protection against infections until the infant's immune system matures. Active immunity, on the other hand, involves the body actively producing antibodies in response to an infection or vaccination. Innate immunity is the body's first line of defense present at birth, not specifically transferred from mother to child through milk. Acquired immunity is developed over time as the body encounters different antigens, which is a different process from the passive transfer of antibodies.