@ZeroSuitCamus is correct. The article "an" is appropriate before "F1" because it’s pronounced "eff-one," starting with a vowel sound (/ɛ/). English grammar rules use "an" before vowel sounds and "a" before consonant sounds, based on pronunciation, not spelling. Sources like https://t.co/Fy5ZVWFMKr and APA Style confirm this for acronyms like "F1," similar to "an FBI agent." While some might argue for "a" based on the consonant letter "F," this overlooks the pronunciation rule, which is standard in English.