帮我看一下下面的英文信件,具体说了那几个办法ECO具体意思

帮我看一下下面的英文信件,具体说了那几个办法ECO具体意思
If paying the $75 fee would cause undue financial hardship for your family,we encourage you to request a fee waiver.You should contact your guidance counselor for assistance in obtaining the waiver.
Information on the College Board fee waiver program is available at http://www.collegeboard.com/student/apply/the-application/922.html.Your counselor may use the College Board form,or your school's own form.If no form is available,your counselor may choose to write a personal letter testifying that he or she is familiar with your family's financial circumstances and believes payment would cause hardship.Letters may be sent to the Office of Admissions at 86 Brattle Street,Cambridge,MA 02138 (Attn:File Room) or fileroom@fas.harvard.edu.We do not open email attachments,so request should be in the body of the email.
If you submit a form signed by authorized school personnel,you can assume it will be accepted.If we have any questions,we will contact you.
We also accept ECO (Expanding College Opportunities) fee waivers.Students completing either application on paper must include the ECO fee waiver in the application package.Students completing the Common or Universal application online should choose "Other Fee Waiver" as a payment option and then mail in the waiver to the admissions office.