Answer:
B) Podcasts
Step-by-step explanation:
Podcasts refers to the the digital system, in which there is easy access to audio and video files, basically it works through a subscription, from that the user can automatically download the information related to the use, in his personal devices like, mobile phones, computers or laptops.
Although podcasts were only audio, now they include everything audio, video, pdf files.
Thus, in the current instance also podcast is the correct choice.