Which of the following is Rumsey’s principle?

• A. The impedance & pattern of antenna is frequency independent if antennasize is specified in terms of angle
• B. The impedance & pattern of antenna is frequency dependent if antennasize is specified in terms of angle
• C. The impedance & pattern of antenna is frequency dependent if antennasize is specified in terms of radiated power
• D. The impedance & pattern of antenna is frequency dependent if antennasize is variable