Bonds with embedded options (affected at all yields?) 玫瑰

洞庭岛主

Hopefully final questions for a while...

Regarding bonds with putable options

-Does the option only decrease duration (compared to plain bonds) if yields are extremely high (enriching the option)?

-For callable, is duration only affected at low yields? According to CFAI....it says all yields.

Could use some clarification on exactly when they are affected.