You were assigned a task to migrate an on-premises application to the AWS Elastic Beanstalk environment. The operating system is Amazon Linux and package managers yum and RubyGems are required in order to install all necessary packages for the application. You have created config files in .ebextensions. In the config files, you added a Package section to install software packages. Which statement is correct for the Package section in the configuration file?

Answer options:

A.Within each package manager, package installation order isn`t guaranteed.
B.For Amazon Linux operating system, only the package manager yum is supported in the Package section. Elastic Beanstalk does not support RubyGems.
C.Only the latest supported version is installed. The version number cannot be specified in the configuration file.
D.Elastic Beanstalk only supports one package manager per config file. So at least two config files are needed. One for yum and the other for RubyGems.

Correct Answer –A
Refer to
https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/customize-containers-ec2.html#linux-packages
on how to use the Packages section for .ebextensions configuration files.
Option A is CORRECT: The order within a package manager isn`t guaranteed.
Take the below snippet for example:
packages:
yum:
 application1: []
 application2: []
Application2 may be installed first.
Option B is incorrect: Because package managers including yum, RubyGems, python, and rpm are supported.
Option C is incorrect: Because software versions can be specified such as below:
packages:
RubyGems:
chef: `0.10.2`
Option D is incorrect: Because one config file can use several package managers. There is no need to use two separate files.