You are developing an application that will manage customer records. The application includes a
method named FindCustomer.
Users must be able to locate customer records by using the customer identifier or customer name.
You need to implement the FindCustomer() method to meet the requirement.
Which two sets of method signatures can you use to achieve this goal? (Each correct answer
presents a complete solution. Choose two.)
A.
Option A
B.
Option B
C.
Option C
D.
Option D
B D
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Why not B and C?
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Not C because the method with int and Int32 is the same signature.
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Nullable values means that the value type in question is a nullable type
Nullable types are instances of the System.Nullable struct. A nullable type can represent the correct range of values for its underlying value type, plus an additional null value. For example, a Nullable, pronounced “Nullable of Int32,” can be assigned any value from -2147483648 to 2147483647, or it can be assigned the null value. A Nullable can be assigned the values true, false, or null. The ability to assign null to numeric and Boolean types is especially useful when you are dealing with databases and other data types that contain elements that may not be assigned a value. For example, a Boolean field in a database can store the values true or false, or it may be undefined.
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