Final answer:
To find the requested information, count the lines in the file, check the length of words for certain criteria, use a set to find unique words, and search for specific occurrences of a word.
Step-by-step explanation:
To find the information requested, you can follow these steps:
A) First, you need to count the total number of lines in the file. This can be done by opening the file and reading each line, incrementing a counter with each line read.
B) To determine the total number of character words with at least four characters, you will need to read each line in the file and split it into words. Then, you can check the length of each word and count the words that have at least four characters.
C) To find the total number of unique words with at least four characters, you can use a set data structure to store the unique words. Iterate through each line, split it into words, and add each word to the set if it has at least four characters. At the end, you can simply count the number of elements in the set to find the total number of unique words with at least four characters.
D) Finally, to discover how many times the word "battery" appeared in the file, you can read each line and use a string search function to find occurrences of the word "battery". Count the number of occurrences and output the result.