A data scientist is reviewing customer comments about a company's products. The data scientist needs to present an initial exploratory analysis by using charts and a word cloud. The data scientist must use feature engineering techniques to prepare this analysis before starting a natural language processing (NLP) model.
Which combination of feature engineering techniques should the data scientist use to meet these requirements? (Choose two.)

A. Named entity recognition
B. Coreference
C. Stemming
D. Term frequency-inverse document frequency (TF-IDF)
E. Sentiment analysis