Boolean expressions involving str methods

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Remember: you can run your code in the Python shell and you can also call help to find out more about a method $($e$.$g$.,$ help$($str$.$isupper$)).$

Select the expression$($s$)$ that produce True.

'apple'.upper$()==$ 'APPLE'

'abc$123\text{'}.$isdigit$()$

'apple'.upper$().$isupper$()$

'apple'.upper$().$islower$()$

'abc$123\text{'}.$isalnum$()$

$\text{'}12\mathrm{.}34\text{'}.$isalnum$()$