The machine to machine is the device that connect directly to other devices.
Hence the correct option is, b) machine to machine (m2m).
The term "machine-to-machine," or M2M, is a general one that may be applied to any technology that allows networked devices to share information and carry out tasks without the need for human intervention. For automatic data transfer and measurement between mechanical or electrical equipment, machine-to-machine (M2M) connections are utilised.
Two endpoints (devices) are often used in M2M communication to facilitate access to various types of networks. They make use of the same IP network protocols that are often employed for data traffic exchange on the internet. Machine-to-machine refers to sensors and tools that can gather data and communicate with one another.
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