In a stable ecosystem, the pyramid of which of the following cannot be inverted?

Which of the following is not considered an ecological pyramid?

What type of ecological pyramid would be obtained with the following data?
Secondary consumer: $120\,g$
Primary consumer: $60\,g$
Primary producer: $10\,g$

Explain various types of ecological pyramids.

Choose the correct option for the given statements:
($T$ = True,$F$ = False)
$(A)$ Pyramid of energy is always upright.
$(B)$ Pyramid of number in a sea is generally inverted.
$(C)$ Pyramid of biomass in a sea is generally inverted.
$(D)$ In most ecosystems,the pyramid of number and energy are always inverted.

$A$: Ecological pyramids cannot explain all the vital functions of any ecosystem.
$R$: Pyramids actually do not explain the role of organisms working at more than one trophic level.