Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on which of the following observations?

Offsprings of cross-pollination of parental generations having three contrasting characters show only one character with belonging.

Offsprings of F₃ generation of a cross made between the plants having two contrasting characters show blended characters of its parents

Offsprings of a cross made between the plants having two contrasting characters shows only one character without any blending

Offsprings of self-pollination of F₁ parents with the same contrasting characters show blended characters of its parents.