# Consider the following statements about biomedical technologies :

(a) During open heart surgery blood is circulated in the heart lung machine

(b) Blockage in coronary arteries is removed by angiography

(c) Computerised Axial tomography (CAT) shows detailed internal structures as seen in a section of body

(d) X-ray provides clear and detailed images of organs like prostate glands and lungs

Which two of the above statements are correct ?

$\begin {array} {1 1} (1)\;a\: and \: b & \quad (2)\;b\: and \: d \\ (3)\;c\: and \: d & \quad (4)\;a\: and \: c \end {array}$