Mark the abstract noun from the
list of nouns given below :
A Frequency
B Hosepipe
C Flame
D Fireman
Subject :IEO Class : Class 6
Subject :IEO Class : Class 5
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Subject :IEO Class : Class 3
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Subject :IEO Class : Class 1
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Subject :IEO Class : Class 7
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Subject :IEO Class : Class 4
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Subject :IEO Class : Class 4
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Subject :IEO Class : Class 1