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Any decimal by default is treated as double, if it was sizeof(5.2f), it would return size of float datatype.

Question should mention size of double type data as it depends on platform. As its not mentioned it can be B or D. Reason for this is as per C standard double should be atleast 8B. (of course some compiler may ignore this).
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b and  d depending upon the operating system of the computer,
 if the arcitecture is 64 bit then ans d if 16bit ans b
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OPTION A

Size of is a special operator will return number of bytes of data types. By default system will take integer data type, if we are not specifying any datatype. Total size is 4 bytes.

Answer:

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