What is the Miranda requirement for police officers to admonish suspects of their Fifth Amendment rights?

" 'Miranda requires that a criminal suspect be admonished of specified Fifth Amendment rights.' " (People v. Whitfield (1996) 46 Cal.App.4th 947, 953.) " 'But in order to invoke its protections, a suspect must be subjected to custodial interrogation ....' [Citation.]" (Ibid.) " 'Thus two requirements must be met before Miranda is applicable; the suspect must be in "custody," and the questioning must meet the legal definition of "interrogation." ' [Citation]."⁵ (Ibid.)