Development is the process in which a child develops through all the aspects such as physical, social, environmental, emotional, language, cognitive, moral, etc. It happens throughout life.The development follows the principle of Spiral advancement, it can be back and forth throughout life.The pace of development is different from age to age.Example: A child can learn their primary language faster than the secondary language.The growth and development of the body organs of the child in the infancy stage are faster than the growth of organs after adolescence.That's why option (2) is correct.Important PointsThe principle of uniformity means that the development of every child is the same in all aspects such as Physical development, Social development, emotional development, etc, at the same pace. but it is not possible. that's why option (1) is incorrect.The principle of uni-directional means that development in the child is only one direction/aspect, which is wrong in the context of child development, child development is multi-directional with different aspects.The principle of discontinuity in child development refers to the development is not continuous but as we know that development in a child is a continuous process throughout life. So option (4) is also irrelevant.Additional InformationDevelopment is not linear in shape, it is Spiral in shape.Development is the product of both 'Heredity' and 'Environment'.Development is from General to Specific.Development is from whole to part.