Given below is the ECG of a normal human. Which one of

Given below is the ECG of a normal human. Which one of its components in human is correctly interpreted below

1. Complex QRS-One complete Pulse
2. Peak T - Initiation of total cardiac contraction
3. Peak P and Peak R together-Systolic and diastolic blood pressures
4. Peak P- Initiation of left atrial contraction only

Peak P-causes diastolic phase in ventricle while R-Peak causes systole in ventricle. Diastolic and systolic phases represented by P & R.