Step 1: Understanding the Question:
We must match each social media platform in List-I with its main feature in List-II. The correct pairs are Snapchat with photo sharing, X with microblogging, LinkedIn with professional networking and WhatsApp with chatting.
Step 2: Work out the pairs:
Snapchat is mainly used to send photos and short videos, so A matches II. X (Twitter) allows very short posts, so it is a microblogging site and B matches III. LinkedIn connects working people and employers, so C matches IV. WhatsApp is a messaging app, so D matches I. The right code is A-II, B-III, C-IV, D-I.
Step 3: Check option 1:
This option pairs Snapchat with chatting and X with photo sharing. Both are mismatched. So option 1 is wrong.
Step 4: Check option 2:
This option gives A-II, B-III, C-IV, D-I. It matches all four pairs found above. So option 2 is right.
Step 5: Check option 3:
This option pairs Snapchat with chatting, X with photo sharing and WhatsApp with microblogging. All three are wrong. So option 3 is wrong.
Step 6: Check option 4:
This option pairs Snapchat with microblogging and X with professional networking. These are wrong. So option 4 is wrong.
Final Answer:
The correct matching is A-II, B-III, C-IV, D-I, which is option 2. \[ \boxed{2} \]