What are the three quality numbers that are measured for speech transmission in narrowband systems?
L-MOS-LQOn, M-MOS-LQOn, N-MOS-LQOn
X-MOS-LQOn, Y-MOS-LQOn, Z-MOS-LQOn
P-MOS-LQOn, Q-MOS-LQOn, R-MOS-LQOn
A-MOS-LQOn, B-MOS-LQOn, C-MOS-LQOn
N-MOS-LQOn, S-MOS-LQOn, G-MOS-LQOn