A 3-year-old child with a complex cardiac defect is admitted with infective endocarditis. Management (in what order) would..

Obtain blood cultures, administer high dose antibiotics, assess for cardiac decompensation

Obtain CBC, CXR and start child on high dose aspirin

Watch for signs of cyanosis & administer high dose steroids

Start high dose antibiotics, obtain serial blood cultures, put the child on high flow oxygen