ndicate whether the following statements are valid or invalid $($Write the question number and invalid or valid$)$:

a$)$CelestialBody$*$ a$\_$body $=$ new Star$()$;

b$)$Star$*$ b$\_$star $=$ new Star$()$;

c$)$Star$*$ c$\_$star $=$ new CelestialBody$()$;