Where is the heart located in the human body?
a) between the right midclavicular line and the right border of the sternum and below the clavicle to the eighth rib.
b) between the second and the fifth intercostal spaces from the right edge of the sternum to the left midclavicular line.
c) between the third and sixth intercostal spaces from the left midclavicular line to the left midaxillary line.
d) between the first and fourth intercostal spaces from the left midaxillary line to the left posterior axillary line.