WHAT HAS 4 LETTERS SOMETIMES 9 BUT NEVER 5 LETTER RIDDL RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

Eye ('e' and 'y' are the only letters). Did you answer this riddle correctly?
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"WHATSAPP"

1st , 2nd , 3rd and 4th letter -> WHAT (A Question)

2nd , 3rd and 4th letter -> HAT (protects our head)
5th , 6th and 7th letter -> SAP or more precisely SAP-LABS ( A German multinational software corporation that makes enterprise software to manage business operations and customer relations)
7th and 8th letter -> PP (same) Did you answer this riddle correctly?
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The letter C. (Sea) Did you answer this riddle correctly?
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An Envelope Did you answer this riddle correctly?
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N and D. These are initials of the months in a year. Did you answer this riddle correctly?
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The quick brown fox jumps over the lazy dog. Did you answer this riddle correctly?
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What has 4 letters.

Sometimes has 9 letters.

Never has 5 letters. Did you answer this riddle correctly?
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Password Did you answer this riddle correctly?
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Tee! Did you answer this riddle correctly?
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Envelope Did you answer this riddle correctly?
YES  NO  

Prince + ss = princess Did you answer this riddle correctly?
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They read the same right side up and upside down. Did you answer this riddle correctly?
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Iced T. Did you answer this riddle correctly?
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The letter Q. Did you answer this riddle correctly?
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A. They are guitar chords Did you answer this riddle correctly?
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