In Python, an expression is a combination of values, variables, operators, and calls to functions, that always evaluates to a single value. For example:

$-2+2$ is an expression that evaluates to $4.$

$2.-$ "Hello" $+$ "World" is an expression that evaluates to "Hello World".

$3.-$ len$("$Python$")$ is an expression that evaluates to $6,$ the length of the string "Python".

Please select the sequence of answers that explain the three cases:

a$)$ Integer and Integer that results$/$evaluates in an integer.

b$)$ A function and a string that evaluates in an integer.

c$)$ A string and a string that result$/$evaluates in a string.