An Alexa Skill Builder is trying to enable a skill in the developer console. The skill model builds without errors, but the Builder is unable to turn on testing.

What could be causing this?

A. The skill’s slot types are invalid.
B. The skill does not have an example phrase

C. The skill does not have an invocation name

D. The skill does not have an endpoint

Reference: https://developer.amazon.com/en-US/docs/alexa/devconsole/test-your-skill.html