Analysis:

Web-based testing tools perform various functions to ensure that websites are functional, user-friendly, and perform well.

B. b and c:

B. To provide information on the size of the web pages and on the time necessary to download them:

Web-based testing tools often analyze the size of web pages and their load times to ensure optimal performance and user experience.

C. To scan and check that no broken or missing hyperlinks are present on a website:

These tools can crawl websites to detect broken or missing hyperlinks, ensuring that all links are functional and lead to the correct destinations.

Explanation of Incorrect Options:

A. To generate HTML and XML that is compliant with industry standards such as W3C:

This is typically a function of development tools rather than testing tools.

D. To allow applications to be tested by simulating a mobile platform's runtime environment:

This describes a function of mobile testing tools, not general web-based testing tools.

E. To provide an engine that allows a user to execute a model describing a system's intended run-time behavior:

This is more related to model-based testing tools rather than web-based testing tools.

References:

The ISTQB CTAL-TTA syllabus and standard practices in web testing tools highlight the importance of performance analysis and link verification in ensuring a robust web experience.

Sources:

ISTQB-CTAL-TTA Syllabus

General knowledge on web-based testing tools.