A nurse is teaching the parents of a 4-month-old infant about promoting psychosocial development. Which parental behavior best supports the infant in achieving the expected psychosocial milestone at this age?

Limiting social interactions to reduce overstimulation during early infancy.

Responding promptly and calmly when the infant cries to foster trust and security.

Encouraging the infant to explore objects independently without interaction.

Allowing the infant to cry for extended periods to encourage self-soothing.