Which of the following command is$/$are used to open a file "loans.txt$"$ in read$-$mode?

Question $5$ options:

None of these options

open$(\text{'}$loans$.$txt$\text{'},\text{'}$rb$\text{'})$

open$(\text{'}$loans$.$txt$\text{'},\text{'}$wb$\text{'})$

open$(\text{'}$loans$.$txt$\text{'},\text{'}$r$\text{'})$