According to significant figures rules for logarithms and antilogarithms, the number of significant figures in the logarithm equals what?

• A. the number of significant figures in the log should equal the number of digits in the mantissa
• B. the number of digits in the log equals the digits in the exponent
• C. the number of significant figures in the log should equal the number of digits in the mantissa
• D. the mantissa carries all significant figures and the exponent is exact

Answer: (C)