$1.$ Consider the following script.$$ What is wrong with the following code?

$$

a$)$ thirdNumber in line $7$ must be in quotes.

b$)$ The words Enter an integer in line $6$ should not be in quotes.

c$)$ The word thirdnumber in line $3$ should have a comma after it$.$

d$)$ The word var must be placed before thirdNumber in line $3.$