What normalization does Valid Palindrome usually require?

Question

What normalization does Valid Palindrome usually require?

Option A — Correct answer

Ignore non-alphanumeric characters and lowercase letters

Option B

Sort the whole string

Option C

Remove only vowels

Option D

Keep punctuation as mandatory matches

Explanation

Ignore non-alphanumeric characters and compare lowercase characters.

Valid Palindrome - Two pointers Pattern Practice Quiz