To answer this question, you need to understand the concept of different attack techniques used in web security.
Let's go through each option to understand why it is correct or incorrect:
Option A) XSS (Cross-Site Scripting) - This option is correct. XSS is an attack technique that forces a website to echo client-supplied data, which then executes in a user's web browser. This allows the attacker to inject malicious code into the website and potentially steal sensitive information or perform unauthorized actions.
Option B) Reflection Attack - This option is incorrect. A reflection attack is a type of DDoS attack that exploits the use of reflection amplification techniques to overwhelm a target system with traffic. It does not involve forcing a website to echo client-supplied data.
Option C) Mirror Attack - This option is incorrect. A mirror attack is not a recognized term in the context of web security. It does not relate to the described attack technique.
Option D) XSLT (Extensible Stylesheet Language Transformations) - This option is incorrect. XSLT is a language used for transforming XML documents into different formats. It is not an attack technique that forces a website to echo client-supplied data.
The correct answer is Option A) XSS. This option is correct because XSS is an attack technique that fits the description provided in the question.