ME test

Question

Which of the following is true ?

A) IPV4 is Stateful Protocol

B) IPV6 is Stateful Protocol

C) Both are true

D) Both are false

Comments

Answer could be c). The following link at least says so. Click on d link mentioned below. 
http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6-solution/white_paper_c11-676277.html

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but the answer given is IPv4 is stateful and IPv6 is stateless