How can the US system of federalism lead to conflict between the states and the federal government?

How can the US system of federalism lead to conflict between the states and the federal government? Choose three correct answers.
1. States may pass laws that contradict federal laws, leading to legal disputes.
2. States have the power to regulate interstate commerce, which can conflict with federal regulations.
3. States can enforce immigration laws independently, causing disagreements with federal policies.
4. The federal government has exclusive control over education policies, which states might contest.
5. The federal government can mandate national standards, which some states may resist.