B
A
71 dB
C
A
68 dB
D
B
71 dB
B
A
C
A
C
A
68 dB
D
A
70 dB
A
C
A
68 dB
C
A
C
A
67 dB
C
A
67 dB
A
B
69 dB
D
B
71 dB
B
A
B