The chemical formula for lithium phosphide is Li3P. Which best describes this ionic compound?

Lithium ions have 1 positive charge, and phosphorus ions have 3 negative charges.
Lithium ions have 3 positive charges, and phosphorus ions have 1 negative charge.
Lithium ions have 1 negative charge, and phosphorus ions have 3 positive charges.
Lithium ions have 3 negative charges, and phosphorus ions have 1 positive charge.