CTET 2 Math and Science 20 Dec 2021 Paper

Which among the following is/are the features of an effective mathematics teacher?
a. Should be competent and confident in the subject matter
b. Should be able to provide procedural knowledge to the students so that they can solve the problems
c. Should be able to create a stimulating classroom environment conducive to learning
d. Continues to investigate new mathematical knowledge and effective teaching strategies