Which approach should you recommend?

You are planning an upgrade for an existing SharePoint 2010 intranet site to support a Spanish language version
of all existing sites. You need to meet the following requirements:
All text on the sites must appear in both Spanish and English.
.Every page on the current English sites must also appear in Spanish.
.All future pages must be created in both languages in a consistent manner.
.The upgrade must involve the least amount of human effort and the least expenditure of hardware and software resources.
Which approach should you recommend?

A.
Install a parallel SharePoint farm using Spanish as the default language.
Recreate all sites and incorporate the
Spanish language version of the site definition by specifying the Spanish language identifier.

B.
Install a language pack for Spanish on the existing SharePoint farm.
Recreate all sites and incorporate the Spanish language version of the site definition by specifying the Spanish language identifier.

C.
Install a language pack for Spanish on the existing SharePoint farm.
Create SharePoint workflows that apply the Spanish language identifier for the sites by specifying Spanish variations.

D.
Install a language pack for Spanish on the existing SharePoint farm.
Apply the Spanish language identifier to the existing site templates.