Final answer:
The correct answer to the given question is 'b) Hilum', which is the notched part of the kidney where the ureter and other structures like blood vessels and nerves join the kidney tissue.
Step-by-step explanation:
The notched part of the kidney where the ureter and other structures join the kidney tissue is called the hilum. The hilum is the concave part of the bean-shaped kidney where blood vessels, nerves, the renal artery, the renal vein, and the ureters enter and exit. It is also responsible for the emergence of the renal pelvis, which is connected to the major and minor calyces within the kidney, and funnels urine via peristalsis into the ureter. Thus, the correct answer to the question is 'b) Hilum'.