Which of the following statements is true about aerobic exercising?

Which of the following statements is true about aerobic exercising?

Research has shown that a single session of aerobic exercise can start to enhance semantic memory in older adults.

It results in decline in higher mental processing of an individual.

Such brisk physical activity is usually dangerous to the heart and lungs and can cause death among adults and aged people.

It fails to meet the body's increased need for oxygen.