Read the following statements regarding the various techniques used in cancer detection.

(i) Cancer detection is based on biopsy and histopathological studies of the tissue and the blood and bone marrow tests for increased cell counts in case if leukemia.

(ii) In biopsy, a piece of the suspected tissue cut into thin section is stained and examined under microscope by the pathologist.

(iii) Technique like radiography (use of X-ray), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancer of the internal organs.

(iv) Computed tomography uses strong magnetic fields and non-ionising radiations to detect physiological changes in living tissues.