CTET Class I to V 6 Jan 2022 Paper

Which of the following is/are important feature/features of a primary class textbook?
(a) Concepts should be linked to the daily life experiences of children.
(b) Concepts should be explained using only mathematical language and symbols.
(c) Focus should be on solving problems using formal algorithms.
(d)The concepts should be introduced with concrete examples wherever possible.
Choose the correct option.