What indicators tell you that the UML diagram shows an object and not a class?

Book

title $=$ "The City & the City" author $=$ "China Mi$$ville$"$ ISBN $="1-4050-0017-1"$

Select one or more:

a$.$ The name is underlined

b$.$ The attributes contain concrete values

c$.$ The attributes have no type

d$.$ There are no arrows attached to it

e$.$ The name is set in a larger font

f$.$ The box has sharp instead of rounded corners

g$.$ The box's background is white