In the equation SQNR = 10 (log_{10} frac{P_x}{P_n} ), what are the expressions of Px and Pn?

(P_x= sigma^2=E[x^2 (n)] ,and , P_n= sigma_e^2=E[e_q^3 (n)] )

(P_x= sigma^2=E[x^2 (n)] ,and , P_n= sigma_e^2=E[e_q^2 (n)] )

(P_x= sigma^2=E[x^2 (n)] ,and , P_n= sigma_e^2=E[e_q^3 (n)] )

(P_x= sigma^2=E[x^3 (n)] ,and , P_n= sigma_e^2=E[e_q^2 (n)] )

In the equation SQNR = 10 (log_{10} frac{P_x}{P_n} ), what are the e

1.	In the equation SQNR = 10 (log_{10} frac{P_x}{P_n} ), what are the expressions of Px and Pn?
A.	(P_x= sigma^2=E[x^2 (n)] ,and , P_n= sigma_e^2=E[e_q^2 (n)] )
B.	(P_x= sigma^2=E[x^2 (n)] ,and , P_n= sigma_e^2=E[e_q^3 (n)] )
C.	(P_x= sigma^2=E[x^3 (n)] ,and , P_n= sigma_e^2=E[e_q^2 (n)] )
D.	None of the mentioned
Answer» B. (P_x= sigma^2=E[x^2 (n)] ,and , P_n= sigma_e^2=E[e_q^3 (n)] )