The correct answer is Incompatibility with the updated platform features, because following a platform upgrade, existing scripts may fail if they have not been updated to interact with new or changed features. Scripts are often designed to work with specific platform capabilities, and if those change, the script may not function as intended. The incorrect options provided, such as expired credentials, are also common issues but do not directly correlate to a recent platform upgrade affecting a previously functional script. Network configuration changes would not be caused by a platform upgrade and would typically lead to issues at a different layer of administration.