Question: following cryptographic object, which was sent to B by A in a recentprotocol: ( NBKPrA mod NA , { | ( NB , NA ,

following cryptographic object, which was sent to B by A in a recentprotocol:
(NBKPrA mod NA ,{|(NB, NA,{({K}KPbB, NA)}xz mod NA,{|{(M, M')}K|}KPrS)|}KPrA)
what must the values of the two variables, x and z, be in order for B to gain access to M'?
1- x= NBKPrB mod NA and z = KPrS
2- x= NAKPrB mod NB and z = KPrA
3- x= NAKPrA mod NB and z = KPrA
4- x= NAKPrA mod NB and z = KPrB
5- x= NBNA mod NA and z = NA
6- x= NBKPrB mod NA and z = KPrB
7- x= NBKPrA mod NA and z = KPrA
8- x= NBKPrA mod NA and z = KPrS
9- x= NAKPrB mod NB and z = KPrS
10- x= NBKPrB mod NA and z = KPrA

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