Question: The reaction conditions for the preparation of 2-methyl-1-methoxypropan-2-ol from 2,2-dimethyloxirane are: 
 Options:  <1> The reaction with methanol in an acid medium. <2> There is no effective synthetic route. <3> The reaction with methylmagnesium bromide and subsequent hydrolysis. <4> The reaction with sodium methoxide in methanol. <5> The reaction with triphenylphosphine.
4