5 pts.] Consider the network shown below. Suppose AS3 and AS2 are running OSPP for their intra-AS routing protocol. Suppose AS1 and AS4 are running RIP for their intra-AS routing protocol. Suppose eBGP and iBGP are used for the inter-AS routing protocol. Initially suppose there is no physical link between AS2 and AS4 4b 3c AS4 2c 3b 1c 2b 1b AS3 AS2 1d AS1 a. Router 3c learns about prefix x from which routing protocol: OSPF, RIP, eBGP, or iBGP? b. Router 3a learns about x from which routing protocol? c. Router Ic learns about x from which routing protocol? d. Router Id learns about x from which routing protocol