what are things to consider when determining the expertise of the author of a source? select two answers.
if they have good ideas about what they are writing about
or
a college degree in the field they are writing about
or
if the author writes in a formal style and serious tone
or
other books or texts they have writing about
or
proven experience in the field they are writing about
a college degree in the field they are writing about
proven experience in the field they are writing about