def validate_0_rtype(instruction) ->bool:
    """Validates R-Type instructions with 0 registers 
    
    Parameters
    ----------
    instruction : R-Type
        R-types with 0 registers
    
    Returns
    -------
    bool
        [Syntax correct or not]
    """
    rd = instruction.destination_register
    rs = instruction.source_register
    rt = instruction.target_register
    check1 = rd is None
    check2 = rs is None
    check3 = rt is None
    return check1 and check2 and check3
