PATH = /bin : /usr : /yourhome

The file /bin/calendar has the following line in it

cal 10 1997

The file /yourhome/calendar has the following line in it

cal 5 1997

If the current directory is /yourhome and calendar is executed

a) The calendar for May 1997 will be printed on screen

b) The calendar for Oct 1997 will be printed on screen

c) The calendar for the current month( whatever it is) will be printed

d) Nothing will get printed on screen