On a router's serial interface connection, what provides the timing signal for the communication link?

In the manifest, the activity element’s nested ______________ element determines which Intent types can launch an Activity-.

a. intent b. filter c. intent--filter d. filter-intents

A ____ is a technologically skilled person who uses his or her skills to obtain unauthorized entry into computers.

A. ?zombie B. ?cracker C. ?script kiddie D. ?whacker