how can he configure this with minimal efforts?

A user has created an S3 bucket which is not publicly accessible. The bucket is having thirty
objects which are also private. If the user wants to make the objects public, how can he configure
this with minimal efforts?

A.
The user should select all objects from the console and apply a single policy to mark them
public

B.
The user can write a program which programmatically makes all objects public using S3 SDK

C.
Set the AWS bucket policy which marks all objects as public

D.
Make the bucket ACL as public so it will also mark all objects as public

Explanation:
A system admin can grant permission of the S3 objects or buckets to any user or make the objects
public using the bucket policy and user policy. Both use the JSON-based access policy language.
Generally if the user is defining the ACL on the bucket, the objects in the bucket do not inherit it
and vice a versa. The bucket policy can be defined at the bucket level which allows the objects as
well as the bucket to be public with a single policy applied to that bucket.