Which of the following options describes a cryptographic attack on an Atom Document?

Which attributes are optional for the element of an Atom?

Which statement is true about the atom:logo and atom:icon elements of an Atom?

Which encryption algorithms are required by Atom processors using Digital Signatures for securing Atom Documents?

Which security mechanism of Atom must be used if message authentication code(MAC) is used to authenticate an Atom Document?

elements may contain one or more elements.

Which Common Atom constructs are supported by Atom 1.0?

Which statements are true about Atom 1.0?

Which one is a required attribute of the element of an Atom?

Which software libraries can be used to access Atom feeds?

Analyze the following identifiers: 1 http://www.example.org/thing 2 http://www.EXAMPLE.org/thing 3 HTTP://www.example.org/thing 4 http://www.example.com/%7ebob 5 http://www.example.com/%7Ebob Which of the above identifiers can be considered similar when comparing the instances of the element of an Atom?