The modified duration:

Multiple Choice

is equal to the Macaulay duration divided by $(1+$ yield to maturity $).$

multiplied by $(-1$ change in the yield to maturity$)$ equals the approximate percentage change in a bond's price.

will be the same for any bonds that have equal times to maturity.

only applies to pure discount securities$.$

must be converted to a Macaulay duration before computing the percentage change in a bond's price.