Which of the following statements are correct with regard to cement mortar?1. Workability of cement mortar can be improved by addition of lime.2. Fly-ash cement is economical in plastering jobs.3. Addition of saw dust improves workability4. Sand in mortar can be replaced by finely crushed fire bricks

Which of the following statements are correct with regard to cement mo

1.	Which of the following statements are correct with regard to cement mortar?1. Workability of cement mortar can be improved by addition of lime.2. Fly-ash cement is economical in plastering jobs.3. Addition of saw dust improves workability4. Sand in mortar can be replaced by finely crushed fire bricks
A.	1, 2, 3 and 4
B.	1, 2 and 3 only
C.	3 and 4 only
D.	1, 2 and 4 only
Answer» E.