Unlike a virtual image, a real image
a. forms at the curvature of a reflecting surface.
b. can be viewed on a screen.
c. cannot be viewed on a screen.
d. is always upright.

try this:

go tos official website.

click on your profile pic at the top right of the screen and click 'edit profile'.

click on "preferences" and press "year of birth".

and then just maybe try to reset whatever error made before by typing in the correct age details again. hope this !

i do believe its (c); they are required to perform any summarization or redistribution tasks

explanation:

its tabs i just searched it up so try tabs