How many color bands are used on resistors that have a tolerance of ±20 percent?

A) three
B) four
C) five
D) six

Resistors with a tolerance of ±20 percent typically use three color bands to indicate their resistance value. The first two bands represent the significant digits, and the third band represents the multiplier. The tolerance is not explicitly marked by a band in this case, as ±20% is considered the default tolerance when no tolerance band is present.