Answer: Podcast
Explanation: In simple words, podcast refers to a digital audio file that is uploaded on the internet and can be easily downloaded through a computer or mobile device.
A podcast is used for many purposes like for reading of novels or for educational seminars etc. Sometimes companies also use podcast for advertisements or promotional purposes when the target audience is low in volume and mass media mediums are of no use.
Hence from the above we can conclude that the correct option is B.
