Which of the following statements is true regarding $IUDs$ used by females?

  • A
    They are implanted under the skin and release progesterone and estrogen.
  • B
    They act as spermicidal jellies.
  • C
    They release copper ions in the uterus that increase phagocytosis of sperm.
  • D
    They block the entry of sperms into the vagina.

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