You need to configure an Amazon S3 bucket to serve static assets for your public-facing web
application. Which methods ensure that all objects uploaded to the bucket are set to public
read? Choose 2 answers
Set permissions on the object to public read during upload.
Configure the bucket ACL to set all objects to public read.
Configure the bucket policy to set all objects to public read.
Use AWS Identity and Access Management roles to set the bucket to public read.
Amazon S3 objects default to public read, so no action is needed.
You can use ACLs to grant permissions to individual AWS accounts; however, it is strongly
recommended that you do not grant public access to your bucket using an ACL.
So the recommended approach is create bucket policy, but not ACL.
Following link give you an example about how to make the bucket content public.