Problem: A 66 y/o AAF is admitted to the ICU with community acquired pneumonia. Vital signs: temperature 103.2 degrees, RR 34 bpm, BP 86/60 mmHg. Her serum creatinine is 2 mg/dL, and her baseline is usually 0.8 mg/dL. She was given Rocephin 1g IV and moxifloxacin 750 mg PO. According to RIFLE (risk, injury, failure, loss of kidney function, and end-stage kidney disease) classification, which stage is this patient in? Group of answer choices Injury to kidney Failure of kidney Loss of kidney function End-stage kidney disease