Which of the following can be run on various systems and is used to update database files?

Java Database Connectivity (JDBC) is correct because it is a Java-based API that allows Java applications to interact with databases. It enables developers to establish connections to databases, execute SQL queries, and retrieve or update records. This API provides a universal way to connect to various relational database management systems (RDBMS) like MySQL, Oracle, PostgreSQL, and others, making it versatile and suitable for use across different operating systems.

In contrast, HTTP is primarily a protocol used for transferring hypertext and is not specifically designed for database operations or updates. FTP is a protocol used for transferring files between systems but does not handle database interactions directly. SOAP, while capable of facilitating communication between applications, is more often associated with web services and is not intrinsically focused on database file updates. Thus, JDBC stands out as the appropriate choice for updating database files across various systems.