Question $2(1$ point$)$

A bimetal thermometer consists of:

a$.$ A filament that is compared to the object being measured.

b$.$ Two dissimilar metals welded together.

c$.$ Two dissimilar metals that generate a voltage when heated.

d$.$ Two copper wires connected together, whose resistance changes when exposed to varying temperatures.

e$.$ A thin$-$bore copper tube, connected to a mercury$-$filled bulb.