All of the above is the correct outcome. Therefore, the correct option is, option(d). NLP stands for Natural Language Processing, which is a Computer Science field that is focused on learning and studying the communications between humans for computer systems. So, that these machines could understand what a human’s voice or audio infer, and take necessary steps after processing it. NLP is useful in All three options which describe Automatic Text Summarization, Automatic Question-Answering systems, and Information Retrieval. Basically, NLP is developing to a state where it could understand human communication at a level that a fully aware human could only decipher.
If you wish to advance in this career, then I would suggest you to take up the NLP certification course from Intellipaat, which offers you with instructor-led training and projects for you to develop specific skill sets. And also, watch our YouTube video on Natural Language Processing Interview Questions to brush your basics and get ready to ace the interview.