The compound shown below undergoes racemization on reaction with aqueous acid. Which of the following structures best represents the intermediate responsible for this process?

Given below are two statements:
Statement $I$: $(CH_3)_3C^{+}$ is more stable than $CH_3^{+}$ as nine hyperconjugation interactions are possible in $(CH_3)_3C^{+}$.
Statement $II$: $CH_3^{+}$ is less stable than $(CH_3)_3C^{+}$ as only three hyperconjugation interactions are possible in $CH_3^{+}$.
In the light of the above statements, choose the correct answer from the options given below.

Which of the following is the most stable carbocation?

Among the given cations,the most stable carbonium ion is

The most stable carbocation is

Which of the following carbanions is the most stable?