Which of the following cognitive abilities are characteristic of a school-aged child in Piaget's concrete operational stage? (select all that apply)

A. Object permanence is a cognitive ability typically developed during the sensorimotor stage (0-2 years), not during the concrete operational stage (7-11 years). B. Egocentric thinking is characteristic of the preoperational stage (2-7 years) and decreases as children enter the concrete operational stage. C. The ability to perform logical operations on concrete objects is a hallmark of the concrete operational stage, where children can think logically about physical objects and events. D. Understanding the concept of conservation, which refers to recognizing that quantity does not change despite changes in shape or arrangement, is a key characteristic of the concrete operational stage. E. Use of symbolic play is more characteristic of the preoperational stage, where children engage in imaginative play rather than concrete operations.