C
B
C
E
C
E
C
C
B
C
B
72 dB
C
B
D
C
72 dB
C
B
C
D
D
72 dB
D
C
72 dB
D
C
72 dB
C
A
C
A
C
B
C
B
C
A
C
B
C
A
C
B
