A security analyst notices a high number of errors in a fingerprint scanner's access logs. What is the MOST likely cause of access issues?

The most likely cause of access issues in the case of a fingerprint scanner experiencing a high number of errors is related to the cross-over error rate. The cross-over error rate (CER) refers to the point at which the rate of false acceptance and false rejection is equal. A higher CER suggests that the biometric system may be too permissive or too restrictive, leading to a significant number of access errors.

When a system has a high cross-over error rate, it can cause legitimate users to be denied access (false rejection) while also potentially allowing unauthorized users to gain access (false acceptance). If the logs show numerous errors, it's highly probable that the scanner's ability to accurately identify users is compromised, resulting in an increased occurrence of access issues.

In contrast, other options mention concepts that may describe aspects of biometric systems but do not directly relate to the specific situation depicted in the question. For instance, false rejection pertains to the incorrect denial of authorized users and does not encompass the broader implications observed with a high cross-over error rate.