Assuming that the diagnosis of acute pyelonephritis is clinical. Renovascular hypertension is considered a form of secondary hypertension and is du...

Assuming that the diagnosis of acute pyelonephritis is clinical. Renovascular hypertension is considered a form of secondary hypertension and is due to renal artery stenosis. It can occur in young people due to vascular dysplastic changes and in the elderly due to atherosclerosis. Which of the following statements is/are correct?
1- Acute pyelonephritis is a bacterial infection of the renal parenchyma.
2- The most common causative agent of acute pyelonephritis is Escherichia coli.
3- Renovascular hypertension is a form of primary hypertension.
4- Renovascular hypertension can occur in young people due to vascular dysplastic changes and in the elderly due to atherosclerosis.

A) 1 and 2 are correct.
B) 2 and 3 are correct.
C) 1, 3, and 4 are correct.
D) 2, 3, and 4 are correct.