When Specifying More Than One Conditional Requirements for a Task

Multiple Choice

When specifying more than one conditional requirements for a task, what is the proper method?

A) - when: foo == "hello" and bar == "world"
B) - when: foo == "hello" - when: bar == "world"
C) - when: foo == "hello" && bar == "world"
D) - when: foo is "hello" and bar is "world"