What are the answers to the following multiple-choice questions about computer science concepts?

Here are the answers to the multiple-choice questions:

37. The design strategy that identifies subtasks based on the operations carried out in them to provide a service or feature is known as Functional design. This approach focuses on the functions the system needs to perform. The correct answer is B.

38. A binary tree whose every node has either zero or two children is called an Extended binary tree (also known as a strictly binary tree or 2-tree). The correct answer is C.

39. In most programming languages, variable names cannot start with a number, nor can they contain spaces. While hyphens are generally not allowed as they are often operators, Value-2 is the least invalid option compared to starting with a number (2value) or containing spaces (Value 2, _Value 2). In some specific contexts or languages (e.g., Lisp), hyphens are permitted in identifiers. The correct answer is B.

40. Quick sort is a classic example of a divide-and-conquer sorting algorithm. It works by partitioning an array into sub-arrays and recursively sorting them. The correct answer is C.

41. Program Readability is typically understood to be the clarity and ease with which a human can understand the comments and program instructions in source code. The correct answer is A.

42. A Watchpoint is a debugging tool used to observe how values change in memory locations without altering program instructions or memory locations. It pauses execution when a specified memory address's content changes. The correct answer is B.

43. Problems for which a program will always guarantee an answer if one exists, but may run forever if there is no answer, are known as Semi-decidable problems (or partially computable problems). The correct answer is D.