Differentiate between tenses: How do you distinguish between past simple and present perfect?

A. Past simple is used with ‘have’ or ‘has’ and the past participle form of the verb

B. Past simple is used for actions at a specific point in the past with specific time markers and regular past tense verbs. Present perfect is used for actions at an unspecified time in the past or with relevance to the present, using ‘have’ or ‘has’ with the past participle form of the verb.

C. Present perfect is used for actions at a specific point in the past

D. Past simple is used for future actions with specific time markers