Which statement/s is true regarding the selective Dissemination of Information?

(1). Concept given by Hans Peter Luhn in 1950.

(2). User profile encompassing the individual's areas of interest, preferred keywords, and other pertinent details.

(3) Document profiles encompass details like title, author, publication date, keywords, and a synopsis or abstract of the content.

(4). Proper feedback mechanism is operationalized.