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'Online Mobile Recharge' is a software system that gives us the information about all mobile service providers under one web portal. This application provides us the complete information regarding any mobile service provider in terms of their plans, options, benefits, etc. Suppose, if "BSNL customer wants to have the information of all the schemes and services provided by the company he/she can have the information and according to his/her convenience the customer can recharge the mobile from the same application. The major advantage of this proposed system is to have the recharging facility of any service provider under one roof. The system functionalities are decomposed into the following major modules. Third party System Administrator: Administrator is the one who monitors all users and user transactions. Admin also monitors all the service providers, all the user accounts, and amounts paid by the users to service providers. All the end- user's request to recharge is verified by the admin and then it is forwarded to the respective service provider for processing. Admin maintains the complete information related to the users, users' recharge transactions, all the information related to the schemes and other information like different recharge discount coupons provided by the service providers. Admin is also having the rights to restrict any user. Service Provider: Service Provider is the one who is the mobile service provider like "BSNL" or "Vodafone". Functionality of this module is to process the recharge request from the System Admin, collect funds from the bank of the customer for recharging, and credit talktime/top-up value to the customer's mobile phone. Finally, it sends an alert message of successful recharge to the Admin and to the customer. TE As a vendor consultant, your team has to develop the above system from scratch in 12 months with team size of 10 to 15 professionals. Discuss the software maintenance process for the above scenario (6 marks) List out the characteristics of maintenance phase of software.(4 marks)