Which nutritional information should the nurse plan to provide the mother of a 6-month-old regarding introduction of solid foods?

Begin introducing solid foods into the child's diet after the child reaches one year of age.

Introduce fruits and vegetables simultaneously into the diet.

Foods are best introduced by mixing them with formula and feeding them to the infant with a feeder bottle.

Foods should be introduced into a child's diet one at a time, at 4 to 7 day intervals.