Documents needed for BC Application

Hi,

Can the documents be scanned in colour? Or, does it have to be in 'Greyscale' or 'Black and white' ?
If the scanned document less than 6MB, does it matter?

Also, Document Type section has the below subsections. I am struggling to find which subsection the above documents should be uploaded to?

Document Type
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1. Other
2. Residence in the UK
3. Finances
4. Proof of Business
5. Life Events
6. Medical Information
7. Sponsors / Employment
8. Proof of Identity / Travel History
9. Educational

Documents need to Upload
-----------------------------------
2 x AN application Form for Mom&Dad
2 x Passports
2 x BRP Cards
2 x Life In The UK Certificate
2 x B1 English Test Certificate
2 x Referee Forms for each applicant
1 x University Degree
1 x University Transcripts
1 x Marriage certificate

2 x MN1 application Form for children (8 & 11 years old)
2 x Passports
2 x BRP Cards
2 x Referee Forms for each applicant
2 x Birth certificates for children

Thanks,