Which of the following statements correctly describe the data wrangling process? Select all that apply. Explain if incorrect. 

a. Data wrangling is the process of retrieving, cleansing, integrating, transforming, and enriching data. 

b. Data wrangling is the process of defining and modeling the structure of a database to represent real-world events. 

c. The objectives of data wrangling include improving data quality and reducing the time and effort required to perform analytics. 

d. Data wrangling focuses on transforming the raw data into a format that is more appropriate and easier to analyze.