please answer as soon as possible

Internet Service Provider 2960-24TT Switcho 2911 Routers 2911 Router6 2960-24TT Switch2 2960-24TT Switch1 2911 Router4 2911 Router 2960-24TT Switch3 Refer to the above diagram The network administrator has decided to use a mix of static and dynamic routing techniques to configure the network. He would like to make sure that maintenance of the network configuration can easily be done in the future with minimum maintenance effort (a) Describe where he will use static routing (which router(s), for what purpose) and where he will use dynamic routing? (b) The network administrator is also considering another routing option/technique for the overall network in order to improve network performance. What do you think the other option/technique is? (your answer has to be related to routing only with explanation and justifications)