第一次投AO，求助两个问题，希望投过AO的帮忙看一下。
1、关于cover letter，第一次投AO，cover letter 是否要写，如何写比较好
2、Fees & Funding，
Page Charges这一项应该怎么选？
a. I agree to pay all mandatory overlength charges, if incurred, for this manuscript.
b. I will contribute the voluntary $125 per page fee toward publication of my paper.
c. I am interested in paying to have my article accessible to all readers (optional open access).
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