In which of the following numbers all zeros are significant?

The precisely accurate numbers in a figure are known to be the significant figures. There are basically 5 rules for identifying significant figures.

- All the non-zero numbers are counted as significant.

- The zeroes between two non-zero digits are counted as significant.

- The leading zeroes are not significant.

- The zeroes to the right of the decimal are significant.

- The trailing zeros in a whole number with the decimal are considered as significant.

According to the above rules, from the given numbers, $20.000$ has all the zeros that are significant. (Zeros to the right of the decimal are significant and the trailing zeros in a whole number with the decimal are considered as significant.)