Which companion was known as "the Keeper of the Secret of God's Messenger"? (poll 9365113)

Which companion was known as "the Keeper of the Secret of God's Messenger"?

Hazrat Abu Bakr (May Allah be pleased with him)

Hazrat Umar (May Allah be pleased with him)

Hazrat Ali (May Allah be pleased with him)

Hazrat Uthman (May Allah be pleased with him)

Hazrat Hudhaifah (May Allah be pleased with him)

Other:

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