Question

What type of PMO each definition implies and a rationale for believing that

Definition 1: As per PMBOK 5^th Edition (PMI, 2013a, p. 10), the PMO is described as "a management structure that standardizes the project-related governance processes and facilitates the sharing of resources, methodologies, tools, and techniques"

Source: Aziz, E. E. (2014). The PMO: your key to strategy execution and results delivery. Paper presented at PMI Global Congress 2014EMEA, Dubai, United Arab Emirates. Newtown Square, PA: Project Management Institute.

Definition 2: "A project management office (PMO) is a group internal or external to a company that sets, maintains, and ensures standards for project management across that organization. They're the keepers of best practices, project status, and direction all in one spot."

Source: Miller, J. A. (2017, October 19). What is a project management office (PMO) and do you need one? CIO. https://www.cio.com/article/267012/what-is-a-project-management-office-pmo-and-do-you-need-one.html