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Dear Student,
The quantum number which specifies the location of electron as well as energy is option 1 Principal quantum number. And Principal quantum number is denoted by n.
As energy of electron is En ( energy in nth shell) and radius of shell is rn ( radius of nth shell) as electron are present in shell hence radius gives the location of electron.
En =  -E0 x z/ n2, where E0 = 13.6 eV , z= atomic number, n = number of shell.
rn  = 0.529 x n2 / z , where  z= atomic number, n = number of shell.
Regards

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