Question

question 19 1 pts which of the following best represent examples of abstraction? select two answers. a courier has to follow a detailed set of precise and detailed instructions to get to her destination. the directions given are followed one at a time in the order they appear. source code is copied from one program to another so that code to perform a particular operation does not need to be rewritten. a single command in a high-level programming language actually requires the cpu to perform multiple different operations, each of which would be represented by a different command in machine code. a set of crochet instructions describes in full how to complete a certain type of named stitch at the start. throughout the rest of the instructions, the stitch is referred to by its name without the full instructions being repeated.

Explanation:

1. Analyze Option 1: A courier following detailed step - by - step directions is an example of an algorithmic process, not abstraction. Abstraction involves simplifying complex details, and this option focuses on following a sequence of instructions without any simplification of details.
2. Analyze Option 2: Copying source code from one program to another is code reuse. It does not involve abstraction. Abstraction is about representing complex things in a simplified way, while code reuse is just reusing existing code.
3. Analyze Option 3: A single high - level programming language command representing multiple machine - code operations is a classic example of abstraction. The high - level command hides the complex details of the multiple machine - level operations, providing a simplified way to interact with the computer's hardware.
4. Analyze Option 4: In crochet instructions, defining a stitch at the start and then referring to it by name later is abstraction. The detailed instructions for the stitch are hidden (abstracted) and only the name is used, simplifying the overall set of instructions.

Answer:

C. A single command in a high - level programming language actually requires the CPU to perform multiple different operations, each of which would be represented by a different command in machine code.
D. A set of crochet instructions describes in full how to complete a certain type of named stitch at the start. Throughout the rest of the instructions, the stitch is referred to by its name without the full instructions being repeated.