What type of case should a gauge be transported in?

The correct choice emphasizes that a gauge must be transported in any case, provided it is properly blocked and braced. This means that the case does not need to be a specific type, such as padded or hard, but rather must ensure that the gauge is secured during transport to prevent movement.

Blocking and bracing are crucial safety measures that protect the gauge from physical damage due to jostling or impacts while it is being moved. This ensures the integrity of the gauge and minimizes the risk of accidental exposure to radiation or contamination. While certain designs, like padded or hard cases, might offer additional protection, the primary requirement is that the gauge must be safely and firmly secured within whatever case is used.

Other options suggest restrictions such as requiring a padded or hard case or prohibiting the use of certain types of containers. However, flexibility in case type, as long as proper blocking and bracing are conducted, allows for a broader range of transport solutions that can be more readily available and practical.