The payload {{7*7}} is a common test string used to detectServer-Side Template Injection (SSTI)vulnerabilities. SSTI occurs when user input is improperly rendered within a server-side template engine (e.g., Jinja2, Freemarker, or Handlebars), allowing the execution of arbitrary template expressions. If the server evaluates {{7*7}} and returns 49 (the result of 7 multiplied by 7), it indicates that the server is processing the input as a template expression, confirming an SSTI vulnerability. This can potentially lead to remote code execution if the template engine supports advanced features.

Option A ("Server Side Template Injection (SSTI)"): Correct, as {{7*7}} is a standard payload to test for SSTI by checking if the server evaluates the expression.

Option B ("Client-Side Template Injection (CSTI)"): Incorrect, as CSTI involves client-side rendering (e.g., JavaScript templates like Mustache), and {{7*7}} would not be evaluated on the client unless explicitly designed to do so, which is not implied here.

Option C ("Both 1 and 2"): Incorrect, as the payload specifically targets server-side processing.

Option D ("None of the above"): Incorrect, as SSTI is applicable.

The correct answer is A, aligning with the CAP syllabus under "Server-Side Template Injection" and "Input Validation."References: SecOps Group CAP Documents - "SSTI Vulnerabilities," "Template Engine Security," and "OWASP Injection Prevention" sections.