When analyzing the philosophical concept of 'Conservation' in Jean Piaget's theory of cognitive development, when a child becomes capable of understanding that pouring a liquid from a wide container into a tall and narrow container leaves its volume unchanged, which of the following other two basic logical abilities work simultaneously along with 'Decentration' in the child's mental operational development according to Piaget?

According to Jean Piaget's theory of cognitive development, the capacity for 'Conservation' develops during the Concrete Operational Stage. Two main logical operations work behind this: first is 'Reversibility', meaning mentally reversing the process back to the original state, and second is 'Compensation', meaning understanding that an increase in one dimension compensates for a decrease in another dimension (such as height increasing when width decreases).