C#.NET strings — select the correct statement about strings.

Difficulty: Easy

A String is mutable because it can be modified once it has been created.
Methods of the String class can be used to modify the string.
A number CANNOT be represented in the form of a String.
A String has a zero-based index.
The System.Array class is used to represent a string.

Correct Answer: A String has a zero-based index.

Explanation:

Introduction / Context:
This item focuses on core properties of C# strings: immutability, indexing, and representation.

Given Data / Assumptions:

We are evaluating stand-alone statements regarding strings.

Concept / Approach:
In C#, string is immutable and zero-indexed. You can create new strings via methods, but existing instances do not change in place.

Step-by-Step Solution:

Immutability: statements (a) and (b) are false; methods return new strings instead of modifying the original.Numeric text: (c) is false; any number can be represented as text (e.g., "123").Indexing: (d) is true — string indexer uses zero-based positions.Representation: (e) is false — strings are System.String, not System.Array, though you can get a char[] copy.

Verification / Alternative check:
Observe that s.Replace("a","b") leaves s unchanged and returns a new string.

Why Other Options Are Wrong:
They contradict immutability or conflate arrays with strings.

Common Pitfalls:
Assuming string behaves like a mutable character buffer; use StringBuilder for that.

Final Answer:
A String has a zero-based index.

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C#.NET strings — select the correct statement about strings.

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