The mortar used for masonry construction are classified based on strength in IS : 2250 and IS : 1905 according to their designations L1, L2, H1, H2, M1 and M2. The correct sequence of increasing order of their strength is
1
L1, L2, H1, H2, M1 and M2
2
L2, L1, M2, M1, H2 and H1
3
L1, L2, M1, M2, H1 and H2
4
M1, M2, L1, L2, H1 and H2