What is the main difference between a supply chain and a value chain?

a$.$ A supply chain focuses its activities on satisfying the final consumer's need, whereas a value chain coordinates the supply chain activities of different supply chain role players.

b$.$ A supply chain has different upstream and downstream linkages, whereas the value chain has only downstrean linkage

c$.$ A supply chain consists of the value$-$adding a activitie ies of fa: $4\mathrm{.}2?$ organisations, whereas a value chain consists of the network of organisations, whereas a value chaih consists of the value$-$adding activities of a specific organisation.