If 5 sin x cos y = 1, 4 tan x = tan y, then
A. `x=(m+n)(pi)/(2)+(pi)/(4)+(-1)^(m)(1)/(2)sin^(-1)(-(3)/(5)),m, n in Z`
B. `y=(n-m)(pi)/(2)+(pi)/(4)+(-1)^(m+1)(1)/(2)sin^(-1)(-(3)/(5)),m,n in Z`
C. `x=(m+n)(pi)/(2)+(pi)/(4)+(-1)^(m)(1)/(2)sin^(-1)((3)/(5)),m,n in Z`
D. `y=(n-m)(pi)/(2)+(pi)/(4)+(-1)^(m+1)(1)/(2)sin^(-1)((3)/(5)),m,n in Z`