Record your answers to these questions in lab$3.$txt$,$ then save the file:

$($a$)$ What is the name of the first variable that appears in the memory model? What is the type

and value of the object that it refers to$?$

$($b$)$ What is the name of the second variable that appears in the memory model? What is the

type and value of the object that it refers to$?$

$($c$)$ What is the name of the third variable that appears in the memory model? What is the type

and value of the object that it refers to$?$

$($d$)$ What is the name of the fourth variable that appears in the memory model? What is the

type and value of the object that it refers to$?$