The Flags field in an IPv$4$ header can be set to different values, depending on fragmentation requirements. Of the following, which is correct about the options that can be set in this field?

The values can be set to prohibit more fragmentation but not to allow further fragmentation.

The value can only be set to Reserved $($Bit $0),$ with no other available options.

The values can be set to allow more fragmentation but not to prohibit fragmentation.

The values can be set to allow more fragmentation or prohibit more fragmentation, depending on the nefwork's requirements.