Which of the following is CORRECT with respect to grammar

Which of the following is CORRECT with respect to grammar and usage? Mount Everest is ________.

1. the highest peak in the world
2. highest peak in the world
3. one of highest peak in the world
4. one of the highest peak in the world

Before superlative article ‘the’ has to be used. “One of ” the expression should take plural noun and so option ‘C’ and ‘D’ can’t be the answer.