What is a quiet push notification in Amazon Cognito?

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.