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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _record(self):
        # type: () -> bytes
        '''
        An internal method to generate a string representing this El Torito
        Validation Entry.

        Parameters:
         None.
        Returns:
         String representing this El Torito Validation Entry.
        '''
        return struct.pack(self.FMT, 1, self.platform_id, 0, self.id_string,
                           self.checksum, 0x55, 0xaa)