What class access modifier means that access to the class is not limited?

A concept dealing with the use of a common identity management scheme across multiple enterprises and numerous applications and refers to the agreements, standards, and technologies that enable the portability of identities, identity attributes, and entitlements across multiple enterprises and numerous applications and supporting many thousands, even millions, of users is _________ .

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

 A(n) ______ often uses prewritten hacking and cracking programs.

A. hacker B. cracker C. script kiddie D. cyberextortionist