G)Reverse Web-Link ·Map For each Urc linking to target, Output target, source> pairs Reduce Concatenate list of all source URLs -Outputs <target, list(source)>pairsReverse Web-Link 12 • Map – For each URL linking to target, … – Output <target, source> pairs • Reduce – Concatenate list of all source URLs – Outputs: <target, list (source)> pairs