Which of following is genotypic ratio of Mendel's monohybrid cross?

A monohybrid cross is a breeding experiment between P generation (parental generation) organisms that differ in a single given trait. 

Trait: Flower colour

Dominant trait: Red colour

Recessive trait: White colour

The above cross represents two homozygous individuals, one with the dominant trait (red flowering plant, RR) and the other with the  contrasting recessive trait (while flowering plant, rr). The F${}_1$ generation of these resulted in all heterozygous red flowering individuals (Rr). The F${}_1$ generation is self crossed to produce the F${}_2$ generation and the results are homozygous and heterozygous red flowering plants (RR, Rr) and homozygous white flowering plants (rr). It is important to point out here that Mendel's experiment and his resultant statistical analysis showed that the total offspring of the F${}_2$ generation was 75% red flowering plants and 25% white flowering plants or a 3:1 ratio. If two homozygous traits are crossed, the phenotype of the F${}_1$ is called the dominant trait. When two F${}_1$ plants are crossed, the F${}_2$ phenotype will have representatives of the dominant trait and the recessive trait (the recessive trait will remain hidden in the F${}_1$ and reappears in the F${}_2$). The phenotypic ratio in the F${}_2$ will be 3:2:1, dominant to recessive. Therefore, the F${}_2$ generation of a monohybrid cross, with dominance,  will result in Phenotypic ratio of 3:1 and Genotypic ratio of 1:2:l.