Which of the below mentioned options is the right solution?

An organization has 20 employees. The organization wants to give all the users access to the organization AWS account.
Which of the below mentioned options is the right solution?

A.
Share the root credentials with all the users

B.
Create an IAM user for each employee and provide access to them

C.
It is not advisable to give AWS access to so many users

D.
Use the IAM role to allow access based on STS

Explanation:
AWS Identity and Access Management is a web service that enables the AWS customers to manage users and user
permissions in AWS. The IAM is targeted at organizations with multiple users or systems that use AWS products such
as Amazon EC2, Amazon RDS, and the AWS Management Console. With IAM, the organizaiton can centrally manage
users, security credentials such as access keys, and permissions that control which AWS resources users can access.
http://docs.aws.amazon.com/IAM/latest/UserGuide/IAM_Introduction.html