Theelseportion of anifstatement is mandatory.

Which of the following is NOT true about social bookmarking?

A) Instead of sharing an entire item, a user bookmarks the page on which the item appears and then sends that bookmark to interested parties. B) All social bookmarking services let users add descriptions to their bookmarks. C) Users can search the social bookmarking site by keyword to find bookmarks of interest. D) Bookmarks from all users are typically organized on the main site of the social bookmarking service.

Some switches can interconnect network interfaces of different speeds. These switches use ____ switching and, typically, a shared memory buffer.

A. symmetric B. shared C. virtual D. asymmetric