Which sentence demonstrates correct comma usage?
a.
The news media including newspapers, news magazines, radio and television are an important source of information in this country.
b.
The news media, including newspapers, news magazines, radio and television, are an important source of information in this country.
c.
The news media, including, newspapers, news magazines, radio and television, are an important source of information in this country.
d.
The news media including, newspapers, news magazines, radio and television, are an important source of information in this country.