Which of the following statements are true? (you can select multiple)Multiple choice

A
a. Aquifers are always confined by aquitards above and below.
B
b. Gravels and sands are typical aquifer materials.
C
c. Aquifers have high porosity and permeability, allowing water to flow easily.
D
d. Clay and mudrocks act as aquitards because they impede water flow.
E
e. Aquitards are impermeable and cannot store any water.
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