Given a Date, return it formatted as a long date string in the format "Month Day, Year" (e.g., "January 15, 2026"). Use the full month name. Return null for null input.
Examples:
Input: inputDate = Date.newInstance(2026, 1, 15)
Output: "January 15, 2026"
Explanation: Month 1 is January, day is 15, year is 2026
Input: inputDate = Date.newInstance(2025, 12, 25)
Output: "December 25, 2025"
Explanation: Month 12 is December, day is 25, year is 2025
Input: inputDate = Date.newInstance(2024, 3, 1)
Output: "March 1, 2024"
Explanation: Month 3 is March, day is 1, year is 2024
Input: inputDate = null
Output: null
Explanation: Null input returns null
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