Consider the layers where ρ1 = 100 Ωm (Ohm-m), ρ2 = 20 Ωm (Ohm-m), ρ3 = 200 Ωm (Ohm-m) and ρ4 = 50 Ωm (Ohm-m). The electrical resistivity curve type is
HK
Multi-layer VES curves are named by taking the layers three at a time: H-type ρ1 > ρ2 < ρ3 (minimum), K-type ρ1 < ρ2 > ρ3 (maximum), A-type ρ1 < ρ2 < ρ3 (ascending) and Q-type ρ1 > ρ2 > ρ3 (descending).
Layers 1–2–3: 100 Ωm > 20 Ωm < 200 Ωm, i.e. ρ1 > ρ2 < ρ3 → H.
Layers 2–3–4: 20 Ωm < 200 Ωm > 50 Ωm, i.e. ρ2 < ρ3 > ρ4 → K.
Combining the two in order gives an HK-type four-layer curve (a minimum followed by a maximum).
Hence, the answer is HK.
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.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
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