Which command flag in DD is used to specify the output file?

The command flag in DD that is used to specify the output file is indeed "of." This flag stands for "output file," indicating the file where the data produced by the DD command will be written. When using DD, it is essential to direct the output to the correct file to ensure the desired results are achieved, whether it’s creating backups, copying files, or converting data formats.

The other options provided do not correspond to valid flags in the DD command syntax for indicating the output file. The "if" flag, for example, is intended for specifying the input file. The "output" and "dest" terms may seem intuitive, but they are not recognized flags in the DD command structure, which is why it is critical to use the correct "of" designation for the output file.