(1) A person is guilty of rape in the first degree when such person engages in sexual intercourse with another person by forcible compulsion where the perpetrator or an accessory:
(a) Uses or threatens to use a deadly weapon or what appears to be a deadly weapon; or
(b) Kidnaps the victim; or
(c) Inflicts serious physical injury, including but not limited to physical injury which renders the victim unconscious; or
(d) Feloniously enters into the building or vehicle where the victim is situated.