(a) In the first part, here should be the word inverted in place of virtual.
Then in this case, the answer of this part should be Concave mirror.
(b) Convex mirror.
(c) The virtual and erect images are formed by both the mirrors, i.e., concave and convex mirror.
In case of convex mirror, if the position of the object is between infinity and the pole of the mirror or the infinity, then in both the cases, virtual and erect images are formed.
In case of concave mirror, if the position of the object is Between P and F of the mirror, then the virtual, erect and enlarged image is formed.
(d) Plane mirror.