This Python script checks whether a number is even or odd. Which casting function would be most appropriate for line $1?$

$1$ num$=\_\_\_\_($input$("$Enter your age"$))$

$2$ if num$\_\_==0$:

$3$ print$("$Number is Even"$)$

$4$ else:

$5$ print$("\_\_\_\_\_\_\_\_\_\_\_\_")$

a$.)$

float

b$.)$

binary

c$.)$

str

d$.)$

int