What heart rate changes are observed as a result of chronic aerobic training?

Submaximal heart rate increases for a standard exercise task, while resting heart rate decreases.

Both submaximal heart rate for a standard exercise task, and resting heart rate decrease.

Resting heart rate decreases but there is no change in submaximal heart rate for a standard exercise task.

Submaximal heart rate decreases for a standard exercise task and resting heart rate increases.