Transition of the electron in the hydrogen atom is shown in the given figure.

 

Identify I, II, III in the above figure.

$\text{ I }\to \text{ Lyman series; II }\to \text{ Paschen series; III }\to \text{ Balmer }$$\text{ series }$

$\mathrm{I}\to \text{ Paschen series; II }\to \text{ Balmer series; III }\to \text{ Lyman }$$\text{ series }$

$\mathrm{I}\to \text{ Paschen series; II }\to \text{ Lyman series; III }\to \text{ Balmer }$$\text{ series }$

$\text{ I }\to \text{ Balmer series; II }\to \text{ Lyman series; III }\to \text{ Paschen }$$\text{ series }$