What will be the output of the following Python code?

a={1:"A",2:"B",3:"C"}
b=a.copy()
b[2]="D"
print(a)

A. Dictionary B. List C. Tuple D. Set

A. setdefault() B. addkey() C. insert() D. newkey()

A. Returns the number of key-value pairs in the dictionary B. Returns the sum of all values C. Returns the length of the longest key D. Returns the length of the longest value

A. items() B. get_items() C. all_items() D. list_items()