In the book of Esther, what is the significance of Esther's hidden Jewish identity and her eventual revelation of it to King Ahasuerus in the context of the Persian court?

A It primarily demonstrates the importance of keeping one's religious beliefs secret in a hostile environment. B It serves as a cautionary tale against intermarriage with foreign cultures. C It highlights the danger of assimilation and the loss of cultural identity. D It exemplifies how divine providence can use seemingly ordinary individuals and their strategic actions, including initially concealing their identity, to protect God's people and reverse a decree of annihilation, showcasing courage, faith, and God's sovereignty.