How do you append data to an existing file in Python?Question 8Answera.open(filename, 'b')b.open(filename, 'w')c.open(filename, 'a')d.open(filename, 'r')

To append data to an existing file in Python, you would use the 'a' mode when opening the file. This can be done using the open() function. Here are the steps:

1. Use the open() function with the filename and 'a' mode as parameters. The 'a' mode stands for 'append', which means that data will be added to the end of the file without deleting any existing information. For example:

file = open('filename', 'a')

2. After opening the file, you can use the write() function to append data to the file. For example:

file.write('This is the data to append.')

3. Once you're done writing to the file, don't forget to close it using the close() function. This is important because it frees up system resources that were used during the file operation. For example:

file.close()

So, the correct answer to your question is c.open(filename, 'a').