Which of the following is an example of a parallel pattern?Prefix scansWriting a programSearching for a keywordExecuting matrix operations

Analysis of Options

1. Prefix Scans: This is a technique often used in parallel computing where each element in an array is processed using previously computed results. It is generally efficient and can be implemented in parallel due to its nature.

2. Writing a Program: This is a general task that can be executed in a sequential manner. While certain parts of programming can be done in parallel (like compiling), the act of writing itself does not inherently exhibit a parallel pattern.

3. Searching for a Keyword: This process can be performed in parallel, especially when using data structures designed for concurrency. However, it often depends on the approach taken (e.g., searching through different sections of a text or multiple files).

4. Executing Matrix Operations: Many matrix operations can be done in parallel, particularly multiplication and addition, as they can be broken down into smaller operations that can be computed simultaneously.

Conclusion

Based on the above analysis, the best example of a parallel pattern among the choices is Executing matrix operations, as they lend themselves well to parallelization, allowing different parts of the matrix to be processed concurrently.