以下哪个Python代码片段正确地执行了一个SQL查询并获取了所有结果？（ ）
cursor.execute("SELECT * FROM students")
results = cursor.scroll()
cursor.execute("SELECT * FROM students")
results = cursor.fetchall()
results = cursor.execute("SELECT * FROM students").fetchone()
cursor.begin("SELECT * FROM students")
results = cursor.fetchmany()