The correct answer is: B. Strain gauge or capacitive transducer
A strain gauge transducer is a type of pressure transducer that uses the principle of strain gauge to measure pressure. A strain gauge is a device that measures the deformation of an object. When pressure is applied to an object, it causes the object to deform. The strain gauge measures the deformation of the object and converts it into an electrical signal. This electrical signal can then be used to measure the pressure.
A capacitive transducer is a type of pressure transducer that uses the principle of capacitance to measure pressure. Capacitance is the ability of two objects to store an electric charge. When two objects are close together, they can store an electric charge. The amount of charge that they can store depends on the distance between them. When pressure is applied to an object, it causes the object to deform. The deformation of the object changes the distance between the two objects. This change in distance changes the amount of charge that the objects can store. This change in charge can then be used to measure the pressure.
Resistive transducers and fiber optic transducers are not typically used to measure blood pressure. Resistive transducers measure the change in resistance of a material when pressure is applied to it. Fiber optic transducers measure the change in the amount of light that is transmitted through a fiber optic cable when pressure is applied to it. These types of transducers are not typically used to measure blood pressure because they are not as accurate as strain gauge or capacitive transducers.
Strain gauge and capacitive transducers are the most common types of pressure transducers used to measure blood pressure. They are accurate, reliable, and relatively inexpensive.