Which of the following statements correctly opens a file in append mode without the need for specifying a close$()$ function for the file?

Question $16$ options:

with open$(\text{'}$my$\_$list.txt$\text{'},\text{'}$a$+\text{'})$ as file:

file $=$ with open$(\text{'}$my$\_$list.txt$\text{'},\text{'}$a$+\text{'})$

with open$(\text{'}$my$\_$list.txt$\text{'},\text{'}$rb$\text{'})$ as file:

file $=$ with open$(\text{'}$my$\_$list.txt$\text{'},$ a$)$