In Amazon Cognito what is a silent push notification?

A. It is a push message that is received by your application on a user's device that will not be seen by the user.
B. It is a push message that is received by your application on a user's device that will return the user's geolocation.
C. It is a push message that is received by your application on a user's device that will not be heard by the user.
D. It is a push message that is received by your application on a user's device that will return the user's authentication credentials.