Final answer:
The privilege against self-incrimination can be invoked prior to arrest by both verbally stating 'I invoke my Fifth Amendment right' and remaining silent.
Step-by-step explanation:
The privilege against self-incrimination can be invoked prior to arrest by both verbally stating "I invoke my Fifth Amendment right." and remaining silent.
The right to remain silent does not exist unless a suspect invokes it unambiguously, as established in the case of Berghuis v. Thompkins.
Additionally, according to the case of Salinas v. Texas, the Fifth Amendment's protection against self-incrimination does not apply to questions asked by law enforcement before arrest or Miranda warning. Instead, to invoke the privilege against self-incrimination, a person must expressly invoke it and not merely remain silent.