"A contract in the sense of Solidity is a collection of code (its functions) and data (its state) that resides at a specific address on the Ethereum blockchain." - Solidity Documentation
In Quorum, Does the deployed contract resides on all the nodes or a majority subset of the nodes? Say 3/4? And when a transaction is sent to a node, it is executed by one node and the result of the state change is propagated. OR the execution is done by all the nodes so the state change is immediately updated.