When an individual converts a rental property to a principal residence

A$.$

an election under ITA$45(3)$ is available to designate the property as principal residence for up to $7$ years prior to the time it stopped being used as a rental property.

B$.$

an election under ITA$45(3)$ is available to designate the property as principal residence for up to $4$ years prior to the time it stopped being used as a rental property.

C$.$

an election under ITA$45(3)$ is available to designate the property as principal residence for up to $6$ years prior to the time it stopped being used as a rental property.

D$.$

an election under ITA$45(3)$ is available to designate the property as principal residence for up to $8$ years prior to the time it stopped being used as a rental property.