Given the following code, determine whether it is a CPU$-$bound or I$/$O$-$bound

process. Justify your answer.

# Function to process a file with checksum calculation

def process$\_$checksum$($source$\_$file, destination$\_$file$)$:

with open$($source$\_$file, $\text{'}$rb$\text{'})$ as src$,$

open$($destination$\_$file, $\text{'}$wb$\text{'})$ as dest:

while True:

# Read a chunk of data from the source file

chunk $=$ src$.$read$(1024*1024)$ # Read $1$ MB at a time

if not chunk:

break

# Calculate checksum

checksum $=$ sum$($chunk$)\%256$

# Append the checksum to the chunk

dest.write$($chunk$)$

dest.write$($checksum$.$to$\_$bytes$(1,$ byteorder$=$'big'$))$

# Call the function with the file paths $($adjust as needed$)$

process$\_$checksum$(\text{'}$large$\_$input$\_$file.dat', 'output$\_$with$\_$check$-$

sum.dat'$)$

print$("$Processing done"$)$