Which of the following are conclusions for the validity of the infant industry argument?

Multiple select question.

There can be a case for some sort of government encouragement.

A tariff is better than a subsidy.

It is hard for a government to know which industries to support because it is difficult to predict which industries can reduce their costs enough in the future to create net national benefits.

Some form of government help other than a tariff is a better infant industry policy than a tariff.