which is true of mobile ladder locking mechanisms select the best answer: may require manual activation must…

which is true of mobile ladder locking mechanisms select the best answer: may require manual activation must be properly engaged before use may be spring loaded all of the above none of the above

which is true of mobile ladder locking mechanisms select the best answer: may require manual activation must be properly engaged before use may be spring loaded all of the above none of the above

Answer

Brief Explanations:

Mobile ladder locking mechanisms can require manual activation (e.g., levers), must be engaged for safety, and may use spring-loading for automatic locking. All options are valid.

Answer:

D. All of the above