C
D is the old way.
A they have not done yet
B not even a thing
I guess the correct answer is A membrane
A mеmbranе is a sеlеctivе barriеr; it allοws sοmе things tο pass thrοugh but stοps οthеrs. Such things may bе mοlеculеs, iοns, οr οthеr small particlеs.
Answer:
B. Wearables.
Explanation:
These are tagged to be a category now in the technology as they are seen to make up the fifth type of personal computers in the question above. These are seen to be attached on the body or sometimes embedded to our outfit and also in other cases hung on a part of our body. They are counted to range from fitness trackers to smart watches, headsets etc. They are said to posses microprocessors which aid their functional ability through its use of the internet.