IS 1489(Part 1):1991 is for ___________(a) Code of practice for general construction of plain and reinforced concrete for dams and other massive structures(b) Specification for Portland pozzolana cement Part 1 Flyash based(c) Specification for Portland-pozzolana cement: Part 2 Calcined clay based(d) Methods of test for pozzolanic materialsThis question was addressed to me during an online interview.This is a very interesting question from IS Codes Related to Cement and Concrete topic in portion IS Codes Related to Cement and Concrete of Concrete Technology