Determine which legal clause the following paragraph belongs to: ( a)  or ( b)  services, or apart of the Services.  20.3 The Customer may refuse to accept such individual to provide the Services and, if so, the who is acceptable to the Customer.  20.4 In the event that it is shown that the Supplier has not carried out the checks or has failed its obligations and will entitle the Customer to terminate this Agreement with immediate effect.