Q.No.2. (18 Marks) Create an activity diagram based on the following narrative: "Microsoft Bing (formerly known as Bing) is a web search engine owned and operated by Microsoft. Bing uses single sign on based on security assertion markup language (SAML) protocol to interrelate with other companies. Bing is like a service provider that provides different services such as yahoo mail of start pages. Partner companies act as identity providers and control user names, passwords, and other information used to identify, authenticate and authorize users for web applications that Bing hosts. Each partner provides Bing with the uniform resource locator (URL) of its single sign on service as well as the public key that Bing will use to verify SAML responses When a user attempts to use some hosted Bing application, such as Yahoo, Bing generates a SAML authentication request and sends redirect request back to the user's browser. Redirect points to the specific identity provider. SAML authentication request contains the encoded URL of the Bing application that the user is trying to reach. The partner identity provider authenticates the user by either asking for valid login credentials or by checking for its own valid authentication cookies. The partner generates a SAML response and digitally signs it. The response is forwarded to Bing Assertion Consumer Service (ACS). Bing's ACS verifies the SAML response using the partner's public key. If the response is valid and user identity was confirmed by identity provider, ACS redirects the user to the destination URL. Otherwise user will see error message