how are scannable resumés different from other kinds?

1. they cannot include any personal information.

2. they must not include any
formatting and can only be saved as RTF files.

3. they should include the job posting at the top of the resumé

a. 1 only

b. 2 only

c. 1 and 2

d. 3 only

please give a sincere accurate answer thank you :)