According to the International Civil Aviation Organisation (I.C.A.O.) the strength of runway pavements, have been coded by

According to the International Civil Aviation Organisation (I.C.A.O.)

1.	According to the International Civil Aviation Organisation (I.C.A.O.) the strength of runway pavements, have been coded by
A.	Seven English alphabets
B.	Last Seven English alphabets
C.	First Seven English alphabets
D.	First seven numbers
E.	None of these.
Answer» E. None of these.