Answer:
none
Explanation:
0.001 cm ... 1 significant figure (none of the decimal zeros before 1 count)
11.0 cm ... 3 significant figures (the decimal zero NOT followed by a non-zero number count)
100 cm ... 1 significant figure (two zeros do NOT count)
100. cm ... 3 significant figures (because there is a decimal point, the two zeros count)
