A period, also called a full stop, is placed at the end of a sentence that makes a statement, a declarative sentence, or gives a command or instruction, an imperative sentence. For example, She reads every evening is declarative, and Close the door is imperative, and both end with a period.
A semicolon is used to link two closely related independent clauses without a conjunction, not to end a sentence outright. A comma separates items, clauses or phrases within a sentence and cannot close it. A dash is used to insert an abrupt break or extra information into a sentence, again not to mark its formal end.
Since the period is the mark that closes declarative and imperative sentences, option 4 is correct.