Concept:The loopback address, also called localhost, is used to access services running on the user's own computer.
Explanation:A locally running website is reached through the standard loopback address
127.0.0.1.
This IP tells the browser to connect back to the same device, so no external internet connection is needed.
Developers use it for testing websites and applications on their own machine.
Option B,
127.0.0.1, is the common localhost address.
Option A,
127.1.0.1, lies in the loopback range, but it is not the standard address used for local web access.
Option C,
1.172.0.0, is not a loopback address.
Option D,
172.0.0.0, is also not a loopback address.
Therefore, the correct IP to enter in a browser to open a local website is
127.0.0.1.
Answer:B.
127.0.0.1