For the following SN1 reaction, draw the major organic product, identify the nucleophile, substrate, and leaving group, and determine the rate limiting step

For the following SN1 reaction, draw the major organic product, identify the nucleophile, substrate, and leaving group, and determine the rate limiting step. 
H3C 

H2O (solvent) 
Select the statement that properly identifies the nucleophile, substrate, and leaving group. 
• C7H.sBr is the substrate, H2O is the nucleophile. and Br is the leaving group. • H2O is the substrate, C7HisBr is the nucleophile. and Br is the leaving group. O Br is the substrate, C7HtsBr is the nucleophile, and H20 is the leaving group. 
The rate limiting step is