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?

Which software libraries can be used to access Atom feeds?

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

Which statements are true about Atom 1.0?

Which Common Atom constructs are supported by Atom 1.0?

Which one is not a required attribute of the Link construct of an Atom?

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

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

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

Which attributes are optional for the element of an Atom?

Which option describes a cryptographic attack on an Atom Document?