Which method is used to replace a substring in a string with another substring?

Which of the following is the correct way to create a string in Python?

A. "Hello, World!"

B. 'Hello, World!'

C. "Hello, World!'

D. 'Hello, World!"

What is the output of the following code:
word = "Python"
print(word[2])

A. t

B. h

C. o

D. y

What does the len() function do when applied to a string?

A. Returns the length of the string

B. Converts the string to lowercase

C. Converts the string to uppercase

D. Removes leading whitespace

Which character is used to access individual elements of a string by index in Python?

A. . (period)

B. , (comma)

C. : (colon)

D. [ and ] (square brackets)