When creating a new user in AWS IAM, an admin sets the user's name and permissions for that user. The user's password and programmatic access keys (if programmatic access is granted) are then generated and shown to the admin.

You successfully created the users shown below. You can view and download user security credentials. You can also email users instructions for signing in to the AWS Management Console. This is the last time these credentials will be available to download. However, you can create new credentials at any time.

What is the best way to share these keys with the new user?