Which two OSI layers map lo IP subnetting and TCP window sizing functions? (Choose two)

The Application layer (Layer 7) manages user-facing protocols such as HTTP and DNS and has no involvement in IP address subdivision or TCP flow control mechanics.

The Data Link layer (Layer 2) handles MAC addressing and frame delivery within a local segment and does not perform logical IP subnetting or TCP window management.

The Transport layer correctly owns TCP window sizing, but alone it does not cover IP subnetting - that belongs to the Network layer - so Transport by itself is an incomplete answer for this 'choose two' question.

The Network layer (Layer 3) handles logical IP addressing and subnetting, which partitions address space into routable subnetworks. The Transport layer (Layer 4) manages end-to-end communication including TCP window sizing, which controls flow and congestion by specifying how much unacknowledged data can be in transit. The answer choice 'Network Session' in this question appears to reference the Network layer; combined with Transport (C), these two layers own the named functions.