In addition to respiratory support, how is pneumonia diagnosed, stabilized immediately, and definitively treated?

A) Diagnosis:
i. Chest X-ray and sputum culture
ii. Blood tests for inflammatory markers
B) Stabilization:
i. Oxygen therapy and fluid resuscitation
ii. Antibiotic administration based on suspected pathogen
C) Definitive Treatment:
i. Antibiotic course completion
ii. Pulmonary rehabilitation for recovery
D) All of the above