Naturalization laws and regulations are

"implied powers of Congress"
"implied powers of the president"
"enumerated powers of Congress"
"enumerated powers of the president"

The correct answer is "enumerated powers of Congress."

The naturalization laws and regulations fall under the "enumerated powers of Congress." The United States Constitution grants Congress the authority to establish a uniform rule of naturalization. This means that Congress has the specific power to create laws and regulations regarding the process by which foreign-born individuals can become U.S. citizens.

The correct answer among the given options is "enumerated powers of Congress."

To arrive at this answer, let's break down the options and understand each term.

1. "Implied powers of Congress": These are powers not explicitly stated in the Constitution but implied by necessary and proper clause (also known as the elastic clause) in Article I, Section 8 of the U.S. Constitution. Implied powers allow Congress to make laws that are necessary and proper to carry out its enumerated powers.

2. "Implied powers of the president": This refers to powers that are not explicitly granted to the president by the Constitution but are implied by the president's role as the chief executive. For example, the power to issue executive orders can be considered an implied power of the president.

3. "Enumerated powers of Congress": These are powers explicitly and specifically listed in the Constitution. Enumerated powers are outlined in Article I, Section 8 of the U.S. Constitution and include the authority to regulate commerce, coin money, establish post offices, and make laws regarding naturalization.

4. "Enumerated powers of the president": The president's enumerated powers are specifically mentioned in Article II of the U.S. Constitution. Some examples include serving as commander-in-chief of the armed forces, granting pardons, and making treaties (with the Senate's consent).

When it comes to naturalization laws and regulations, the authority to establish and regulate these falls under Congress' power. Therefore, the correct answer is "enumerated powers of Congress."