Can you discuss the differences between quality assurance, quality control, and software testing?

"While many people consider these three practices to be similar, they are very distinct from one another. Quality assurance focuses on continuous quality and preventing defects. It is proactive and preventative and compliments the software development process. Quality control focuses on meeting production standards. It functions to identify and fix defects. Quality control is reactive and is used to prevent defective products from reaching the market. Software testing is the process used within the quality assurance program to test specific features of a product during its development to identify and resolve defects before they have larger consequences. It is executed at each stage of the development process."