The 't-shirt sizing' model described in the question is a form of tiered or banded pricing, where different rates are applied to different ranges of resource consumption. In VMware's cost management tools, this is implemented using the "slab" rate method. Each "slab" defines a range (e.g., 1-2 vCPU for 'Small') and an associated price. This allows an administrator to create a non-linear pricing structure that aligns with the accounting team's requirements, rather than using a flat rate per vCPU or per GHz.

A. Base rate storage per GB. This option is incorrect because it defines a pricing model for storage resources, whereas the question specifically asks for a method to price vCPU.

C. Base rate CPU per GHz. This is a linear pricing model that charges based on the amount of CPU frequency allocated or consumed. It does not support the tiered 't-shirt size' structure based on vCPU count.

D. Base rate CPU per vCPU. This is a linear pricing model that applies a fixed cost for every single vCPU. It cannot be used to create different price points for ranges of vCPUs as required by the 't-shirt size' model.

1. VMware vRealize Business for Cloud 7.2 Documentation

"Add a Rate Factor to a Pricing Policy".

Reference Details: In the section describing rate factors

the documentation states: "You can also define a slab-based pricing for a rate factor. Slab-based pricing is a method of charging for a service in steps or slabs. You can define a range for a service and set a price for that range. You can add multiple slabs with different price for each slab." This directly corresponds to the 't-shirt size' scenario.

2. VMware Aria Operations 8.10 Documentation

"Add or Edit a Rate in a Pricing Policy".

Reference Details: This more recent documentation demonstrates the persistence of the concept. In the section on editing rates

it describes "Slab Pricing" as a method where "You can define a range for a service and set a price for that range. You can add multiple slabs with different prices for each slab." This confirms that "slabs" are the official mechanism for implementing tiered pricing for resources like vCPU.