What characteristic applies to a low risk CSP?

A low risk CSP is defined as a compounded sterile preparation that has a small probability of microbial contamination before administration. In comparison to high or medium risk CSPs, low risk CSPs have a low number of sterile ingredients and a limited number of entries into a sterile container or device. In option A, the number of sterile ingredients does not necessarily fit the criteria for a low risk CSP. In option C, the use of non-sterile ingredients automatically disqualifies a CSP from being considered low risk. In option D, using more than 3 sterile ingredients goes against the definition of a low risk CSP. Therefore, option B is the most accurate choice for a low risk CSP.