Which of the following statements are true about duration?

Check all that apply:

It is used to assess the credit risk of a bond.

All else equal, a bond with lower duration is riskier than a bond with higher duration.

The duration of a zero$-$coupon bond is equal to its time to maturity.

It can be interpreted as the effective average maturity of the bond's cash flows $($i$.$e$.$ a weighted$-$average of the time periods when the bond makes payments$).$