A ________ query is used to summarize data organized by field values

Ratings of A2 and above are simply theoretical and there are no systems that currently meet these criteria

Indicate whether the statement is true or false.

The ________ service began in September 2011, and enables users to take photos and record videos. The sender can set a time limit for when the picture or video disappears (1 to 10 seconds). From a forensics perspective, these images are often still present on the user's device even though the user thinks the file has been deleted

Fill in the blank(s) with the appropriate word(s).