For the same situation as in Exercise 4.5, which of the following is always true of the name resolution process, assuming that all name servers are configured correctly and no messages are lost?

A. If M had answered a query for the IP address corresponding to www.cslab. scholarly.edu at some time in the past, then it can respond to the current query without contacting any other name server.

B. If M has a valid IP address of a functioning name server for cslab.scholarly.edu in its cache, then M will get a response from that name server without any other name servers being contacted.

Data From Exercise 4.5

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4.5 While browsing the Web, you click on a link that identifies an Internet host named www.cslab.scholarly.edu. Your browser asks your Domain Name System (DNS)