Final answer:
Statements a) 'Spiders crawl the web to index content.' and c) 'Bots automate repetitive tasks on the internet.' refer to programs known as spiders, web crawlers, and bots. Web crawlers are not used to fix software bugs, nor are they primarily intended to analyze network security.
Step-by-step explanation:
When discussing programs known as spiders, web crawlers, and bots, the statements that refer to them correctly are:
- a) Spiders crawl the web to index content. This statement is accurate as web spiders, also referred to as web crawlers, are designed to browse the internet methodically and automatically for the purpose of web indexing. Search engines use these to update their content and to index new pages.
- c) Bots automate repetitive tasks on the internet. Bots are software applications that run automated tasks over the internet. These can include web crawlers but also other repetitive tasks that do not necessarily involve indexing.
Statement b) is incorrect because web crawlers do not fix bugs in software; their function is related to indexing the web. Statement d) is incorrect as it is more typically associated with specific types of security software called network spiders, which are designed for identifying security vulnerabilities, rather than the general term 'spiders' used in web indexing.