Answer:
C
Through the target's web server's log.
Step-by-step explanation:
A web server is a server software or a hardware that is fully dedicated to the running of that software. It satisfies a user's request on the www that is the World Wide Web. A web server can, contain just one or more websites.
It processes incoming network requests over HTTP and several other related protocols.
It also stores the webpages the user have visited in the past. Tracking the target's web server to know what enter or left can expose the hacker that is scanning a user's web server.