Consider the following types of electromagnetic radiations ; radio waves, infrared, visible light. Which of the following statements are correct?i) Only radio waves can be used to transmit audio informationii) Only infrared radiation is emitted by very hot object.iii) Only visible light can be detected by humans

I) Audio information can be transmitted in the form of optical waves through optical fibresII) very hot objects emit not only infrared radiation but also emit visible radiationIII) Humans can defect infrared radiations by the heat on the portion of body exposed by radiations.There fore, all the given statements are not completely correct. Hence the option 4 is correct