Caleb has just installed an open-source application on a web server to host a wiki for the customer service department. Which of the following should he do to harden the application after installation?
a. Change the default password. b. Disable SSH and enable telnet on the server for remote administration. c. Configure SNMPv1 on the server to help with automation and management. d. Block port 443 on the firewall in front of the web server.