Which of the following statements best describe the definition of a Hall-Effect sensor?

Select one alternative:

Hall-effect sensor detects the presence of a objects made from any type of a material,

while there is no need for contact with objects

Hall-effect sensor detects the presence of a magnetic field, while sensor and object need

to be in contact

Hall-effect sensor detects the presence of a magnetic field, while there is no need for

contact with objects

Hall-effect sensor detects the presence of a nonferrous metallic materials, while there is

no need for contact with objects