Final answer:
All the provided statements about uterine manipulators are true, including the use of Humi and Zumi, their design to prevent uterine perforation, and the use of an inflated balloon for manipulation and preventing leakage.
Step-by-step explanation:
The correct statement about uterine manipulators is that all the provided options are indeed true. Popular types such as the Humi and Zumi are designed to enter the cervix and uterus with a rounded, smooth tip to mitigate the risk of uterine perforation.
Once these instruments are inserted into the uterus, a balloon can be inflated to prevent leakage and assist with the manipulation of the uterus during surgical procedures.