$[4$pt$]$ The getnrats function, assisted by the strs$2$rat function, prompts the user to enter a sequence of integer pairs, representing rational numbers, and returns the data as a list of tuples of integers. The functions validate user input in part through exception handling. What completes getnrats correctly?

def getnrats$()$: rationals $=[]$ numstr $=$ input$("$Enter an integer to divide $($Q to quit$)$: $")$ while numstr.upper$()!="$Q$"$: denstr $=$ input$("$Enter a positive integer to divide by: $")$ try: $($num$,$ den$)=$ strs$2$rat$($numstr$,$ denstr$)$ rationals.append$(($num$,$ den$))$ print$($str$($error$))$ numstr $=$ input$("$Enter an integer to divide $($Q to quit$)$: $")$ return rationals def strs$2$rat$($numstr$,$ denstr$)$: num $=$ int$($numstr$)$ # May raise exception den $=$ int$($denstr$)$ # May raise exception if den $==0$: raise ValueError$("$Denominator of rational cannot be $0!")$ elif den $<0$: $($num$,$ den$)=(-$num, $-$den$)$ return $($num$,$ den$)$

Author: MK$,$ Editor$($s$)$: JFM$,$ DJ

Question $1$Answer

a$.$

except ValueError:

cross out

b$.$

except ValueError as error:

cross out

c$.$

except IOError:

cross out

d$.$

except IOError as error:

cross out

e$.$

finally: