Which of the following statements is false? $(4\mathrm{.}12\mathrm{.}1)$

The following session calls the string object s$\text{'}$s lower and upper methods, which produce new strings containing all$-$lowercase and all$-$uppercase versions of the original string, leaving s unchanged:

In $[1]$: $s=$ 'Hello'

In $[2]$: s$.$lower$()$ # call lower method on string object $s$

out $[2]$: 'hello'

In $[3]$: s$.$upper $(),$

Out $[3]$: 'HELLO'

When run, the snip it will output TRUE.

In $[1]$: str$1=$ 'Hello'

In $[2]$: str$2=$ 'HELLO'

In $[3]$: $str1.$lower$()==str2.$lower$()$

Out $[3]$: TRUE

After the following session, s contains 'HELLO'.

In $[1]$: $s=$ 'Hello'

In $[2]$: s$.$lower$()$ # call lower method on string object $s$

Out$[2]$: 'hello'

In $[3]?$ s$.$upper$()$

Out$[3]$: 'HELLO'

A method is simply a function that you call on an object using the form

object$\_$name.method$\_$name$($arguments$)$