What is the default port number used by hub in Selenium?

What is the default port number used by hub in Selenium?
What is the default port number used by hub in Selenium,While working with Selenium Grid,we require to configure Selenium Hub to connect to different machines and it will have default port number.

What is the default port number used by hub in Selenium?

a. 4444
b. 2222
c. 3434
d. 2290

ANSWER : 4444

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