Which of the following best describes a data structure?

$($a$)$ A data structure specifies what data is stored and what operations can be execu on that data but not how.

$($b$)$ A data structure specifies exactly how the operations are implemented and exac how the data is stored.

$($c$)$ A data structure has only static methods and attributes.

$($d$)$ A data structure is protected.

$($e$)$ A data structure is garbage collection.