Which of the following changes will make it necessary to have the skill re-certified?

An Alexa Skill Builder published a skill and now wants to update it.
Which of the following changes will make it necessary to have the skill re-certified? (Choose two.)
A. Adding a new intent in the interaction model
B. Changing the text of a skill response
C. Adding a sentence to the skill description
D. Changing the URL of the image on a skill card
E. Updating the backend to point to a new database