Why is it logical to use the set of features that result in the smallest average root mean squared error when performing cross-validation

Of the following pieces of information in a document, for which would you most likely insert a mail merge field?

What does the https: // mean when you type in a website

7. design a circuit with three inputs (x, y, and z) representing the bits in a binary number, and three outputs (a, b, and c) also representing bits in a binary number. when the input is 1, 2, or 3, the binary output should be one lesser than the input. when the input is 4, 5, or 6, the binary output should be one greater than the input. when the input is 0, the output is 0, and when the input is 7, the output is 7. show your truth table, all computations for simplification, and the final circuit.