What is the purpose of block grants given to state or local governments?

It is to be contingent on state$/$local endorsement of so$-$called "social" federal legislation.

It is to be spent on a specific policy area decided on by the federal, state, and local governments.

It is to be divided into discrete "blocks" of grants, each limited to $$100$ million.

It is to be tied to federal mandates that state or local governments must then implement.

It is to be spent in the way the state or local government decides to spend it$.$