Title: Mastering IP Address Manipulation in Programming

How can you retrieve the first 3 values of an IP address as key-value pairs?

a) KeyValue(IP,3) b) IP[0], IP[1], IP[2] c) IP[1], IP[2], IP[3] d) Top3(IP)

Answer:

The correct expression to return the first three values of an IP address as key-value pairs is b) IP[0], IP[1], IP[2], which uses standard array indexing starting at 0.

The correct return expression that would return the first 3 values of the IP field as key-value pairs is option b) IP[0], IP[1], IP[2]. An IP address is typically represented as a sequence of numbers separated by periods. In many programming languages, it can be stored as an array or list with each segment of the IP address being an element in that array. When accessing the elements of an array, indexing usually starts at 0. Therefore, to retrieve the first three segments of an IP address, you would access the elements at indices 0, 1, and 2. This is what option b specifies, making it the correct choice.

Option a) KeyValue(IP,3) seems to suggest a function call that is not standard for accessing array elements. Option c) IP[1], IP[2], IP[3] incorrectly assumes array indexing starts at 1, skipping the first element at index 0. Option d) Top3(IP) is vague and does not clearly refer to a standard method of obtaining the first three elements of an array.