The compound of Portland cement which contributes to the strength after two to three years is
(A) Tri-calcium silicate
(B) Di-calcium silicate
(C) Tri-calcium aluminate
(D) Tetra-calcium alumino ferrite
(A) Tri-calcium silicate
(B) Di-calcium silicate
(C) Tri-calcium aluminate
(D) Tetra-calcium alumino ferrite