Which is a correct statement?

A supply shock will cause a variation of demand$-$pull inflation that can lead to hyperinflation.

It is relatively easy to distinguish between cost$-$push and demand$-$pull inflation even if you dornt know the source of the inflation.

Demand$-$pull inflation will continue so long as there is excess total spending in the economy.

Cost$-$push inflation will continue because increased per$-$unit cost will lead to a reduced supply.