What Are the Four Evidence-Based Standards Identified by the Leapfrog

What are the four evidence-based standards identified by the Leapfrog Group to reduce medical errors?

A) Computerized physician-provider order entry, evidence-based hospital referral, ICU physician staffing, and the use of Leapfrog Safe Practices scores
B) Computerized physician-provider order entry, evidence-based visiting nurse referral, ED physician staffing, and the use of Leapfrog Safe Practices scores
C) Computerized primary care provider order entry, evidence-based hospital referral, ICU physician staffing, and the use of Leapfrog Safe Medication scores
D) Computerized nurse practitioner-provider order entry, evidence-based outpatient referral, ED physician staffing, and the use of Leapfrog Safe Medication scores