B is corect answer. ISAPI filters can be registered with IIS to modify the behavior of a server. Ref.: https://docs.microsoft.com/en-us/previous-versions/iis/6.0-sdk/ms524610(v=vs.90)
The Heartbleed Bug is a serious vulnerability in the popular OpenSSL cryptographic software library. This weakness allows stealing the information protected, under normal conditions, by the SSL/TLS encryption used to secure the Internet.
This compromises the secret keys used to identify the service providers and to encrypt the traffic, the names and passwords of the users and the actual content.
https://heartbleed.com/
Defend Against Web Server Attacks
Remove unnecessary Internet Server Application Programming Interface (ISAPI) filters from the web server. Remove all unnecessary IIS script mappings for optional file extensions to avoid exploitation of any bugs in the ISAPI extensions that handle these types of files. (P.1697/1681)
measure to defend against web server attacks: Remove unnecessary Internet Server Application Programming Interface (ISAPI) filters from the web server.
Module
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