What characterizes a movable guard in a machine?

A movable guard is characterized by its ability to be repositioned or adjusted while remaining attached to the machine. This feature provides a significant safety advantage, as the guard can be moved to allow for operation or maintenance access while still providing protection against hazards. This aspect ensures that workers can perform tasks more safely and efficiently, as the guard is not entirely removed but instead can be shifted as necessary to adapt to the machining process.

In contrast, the other options highlight characteristics that do not align with the definition of a movable guard. For instance, complete removal of a guard would imply that it is not movable but instead designed for temporary removal. Adjustability without tools suggests ease of use, but that does not capture the essential characteristic of the guard remaining part of the machine. Lastly, a permanently fixed guard would not provide the benefits of flexibility and access that a movable guard offers.