Cardiac exercises! They get your heart pumping blood quicker to strengthen it! :)
It's is all of the above. Just a little hint for you, when there is the option- all of the above, chances are that's the answer.
hey man i believe it is d hope this helps
It’s important because your heart must beat faster during exercising because the increase of the heart rate also will need a increase of cardiac output to deliver the necessary blood flow to the muscles.
Hope this help