Which command compiles the Java source code file Welcome.java?

A software application you can use to make voice or video calls is ________

Fill in the blank(s) with correct word

How does a change management system ensure that updates to software do not cause unexpected downtime or reduction of security?

A. By scheduling changes to be implemented over a weekend B. By aggregating updates from multiple vendors to be applied simultaneously C. By only rolling out updates on the third Thursday of each month D. By testing patches thoroughly before deployment