What Are the Conditions That Have to Be Met by a Provision

What are the conditions that have to be met by a provision of EU law to have direct effect?

A) Direct effect occurs where a provision of EU law is of a general application and is directly applicable in all Member States.
B) Direct effect occurs where a provision of EU law is clear, precise and unconditional.
C) Direct effect occurs where a provision of EU law is on a list of directly effective provisions established by the Commission.