During a penetration test, you are tasked with assessing the security of a web server. Your goal is to enumerate potential vulnerabilities that could be exploited. Which Nmap command should you run to perform a comprehensive set of vulnerability checks against the target web server, which is located at 192.168.1.50?
nmap -T4 192.168.1.50
nmap -O --script=safe 192.168.1.50
nmap --script=vuln 192.168.1.50
nmap -sV --script=default 192.168.1.50