If x(n) is a complex valued sequence given by x(n)=xR(n)+jxI(n), then what is the DFT of xR(n)?

( sum_{n=0}^N x_R (n) cos u2061 frac{2 kn}{N}+x_I (n) sin u2061 frac{2 kn}{N} )

( sum_{n=0}^N x_R (n) cos u2061 frac{2 kn}{N}-x_I (n) sin u2061 frac{2 kn}{N} )

( sum_{n=0}^{N-1} x_R (n) cos u2061 frac{2 kn}{N}-x_I (n) sin u2061 frac{2 kn}{N} )

( sum_{n=0}^{N-1} x_R (n) cos u2061 frac{2 kn}{N}+x_I (n) sin u2061 frac{2 kn}{N} )

If x(n) is a complex valued sequence given by x(n)=xR(n)+jxI(n), then

1.	If x(n) is a complex valued sequence given by x(n)=x_R(n)+jx_I(n), then what is the DFT of xR(n)?
A.	( sum_{n=0}^N x_R (n) cos u2061 frac{2 kn}{N}+x_I (n) sin u2061 frac{2 kn}{N} )
B.	( sum_{n=0}^N x_R (n) cos u2061 frac{2 kn}{N}-x_I (n) sin u2061 frac{2 kn}{N} )
C.	( sum_{n=0}^{N-1} x_R (n) cos u2061 frac{2 kn}{N}-x_I (n) sin u2061 frac{2 kn}{N} )
D.	( sum_{n=0}^{N-1} x_R (n) cos u2061 frac{2 kn}{N}+x_I (n) sin u2061 frac{2 kn}{N} )
Answer» E.