Briefly explain the relevance of dag and tac at the intermediate code generation phase . give an example of dag(directed acyclic graph) with its equivalent tac(three-address code).

Which location-sharing service offers items for users as a gaming component and also allows them to collectively link their check-ins to publish a trip? a. whrrl b. buzzd c. foursquare (this option is wrong i already tried) d. gowalla for plato