Which of the following operations do have a constant big$-$O running time on python lists $($i$.$e$.$ which operations are not expected to depend on the number of items in L$)?$Mark all that apply $($one or more$).$Reading the value at a certain index:L$[5]$Changing the value at a certain index:L$[5]=$ 'hello'Removing the first item in the list:L$.$pop$(0)$Creating a slice of the last $3$ items:L$[-3$:$]$Adding an item to the end of the list:L$.$append$(\text{'}$hello$\text{'})$