Morgon ko linkage kon generation me mila

Which classification system is konwn as 2-dimensional classification system

Artificial
Natural
Phylogeny
None

Epistasis ratio is
A) 9.:3:3:1
B) 15:1
C) 12:3:1
D) 1:1:1:1

morgon ko linkage kon generation me mila
a)f1 generation
b)f2
c)f3