You have a customer who has installed an FTP client on her Windows XP computer and wants to use it to update a number of Websites she administers. She says she has a good Internet connection and is able to surf the Web and send and receive e-mails, but she can’t get her FTP client to connect to any of the required Websites. She has verified that her username and password for those sites is good, and she can ping the IP addresses and domain names for each of the required servers. What should you check?A. Check the security settings on the FTP client to make sure they aren’t blocking Internet access. B. Check the firewall on Windows XP to see if it’s blocking port 21.C. Use the tracert utility to check for problems on the Internet that could be preventing access to the required sites. D. Access the domain name mapping for the DNS records for the Websites using nslookup.