A Web Server Administrator Has Changed the Domain Registrar's a Record

Multiple Choice

A web server administrator has changed the domain registrar's A record for the company's website. External users can reach the website, but internal users are unable to do so. The web server is accessible by typing the internal IP into a web browser. Which of the following is the reason why the web server cannot be accessed?

A) The NAT has not been configured to point to an internal resource.
B) An egress firewall rule is blocking access to the web server.
C) The IDS has determined it is a rogue web server.
D) The corporate DNS server has not been updated.