Automated tasks of a Business Process Management System $($BPMS$)$ are classified into business rules, scripts, send, receive, and services. Which one of the following is the best description of script tasks?

Group of answer choices

A$.$ Tasks that execute some code internally to the BPMS$.$

B$.$ Tasks that are executed by an external application.

C$.$ Tasks that triggers a business rule to be executed by an external rules engine.

D$.$ Tasks that wait for a message from an external service