Try giving these two commands:

$ echo cat

$ cat echo

Is each of the following an absolute pathname, a relative pathname, or a simple filename?

a$.$ milk$\_$co

b$.$ correspond$/$business$/$milk$\_$co

c$./$home$/$max

d$./$home$/$max$/$literature$/$promo

e$...$

f$.$ letter. $0210$

Is each of the following an absolute pathname, a relative pathname, or a simple filename?

a$.$ milk$\_$co

b$.$ correspond$/$business$/$milk$\_$co

c$./$home$/$max

d$./$home$/$max$/$literature$/$promo

e$...$

f$.$ letter. $0210$