Rank the following carbocations in order of most stable to least stable. 
Definitions:
Costimulation
An essential process in the immune response, involving a secondary signal to T cells from antigen-presenting cells, ensuring a proper and controlled immune activation.
Interleukin 2
A type of cytokine produced by T-cells that plays a critical role in the regulation of immune responses, including the activation and proliferation of lymphocytes.
Suppressor T Cell
Subset of T lymphocytes that decreases the activity of B cells and T cells.
Cytokines
Small proteins released by cells, especially immune cells, that have a specific effect on the interactions and communications between cells.
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