Assume that $r is 255, and $g and $b are both 0. What is the correct code to output “#ff0000”?

Here is the answer of the question: Assume that $r is 255, and $g and $b are both 0. What is the correct code to output “#ff0000”?

• printf(‘#%2x%2x%2x’, 255, 0, 0);
• printf(‘#%2X%2X%2X’, $r, 0, 0);
• printf(‘#%x%x%x’, 255, 0, 0);
• printf(‘#%02x%02x%02x’, 255, 0, 0);

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