A. If the ionisation energy of hydrogen atom is 13.6 eV then its ionisation potential is 13.6 V.
B. All the setries of hydrogen spectrum have their respective shortest wavelength line corresponding to $n=\infty$.
C. Paschen, Brackett and Pfund series all the three series are obtained in UV region.
D. The total energy of an electron is equal to the negative of its kinetic energy in the same orbit.

Choose the most appropriate answer from the options given below:

A, B, D only

The correct answer is Option (2) → A, B, D only