Which of these is NOT a standard port for web services?

The choice indicating port 70 as not being a standard port for web services is accurate because standard ports for web services are more commonly recognized as 80 and 443.

Port 80 is used for standard HTTP traffic, which serves web pages over the internet, while port 443 is designated for HTTPS traffic, facilitating secure communications over the web. Port 25 is traditionally used for SMTP (Simple Mail Transfer Protocol), which is also a well-known standard port, primarily for email transmission.

Port 70, on the other hand, is associated with the Gopher protocol, which was used for distributing, searching, and retrieving documents over the Internet in the early days of the web but is largely obsolete today. As web services have evolved and standardized around ports 80 and 443 for their fundamental functions, port 70 does not fit into the category of standard ports for modern web services. This distinction helps clarify why port 70 is categorized correctly as not being a standard port for web services.