Select the correct answerC functions parameters are always by default:OptionsPass by referencePass by valuePass by pointerAll given options are correct

To determine the correct answer regarding C function parameters, let's break down the concepts involved:

1. Understanding Function Parameters in C: In C programming, function parameters can be passed in different ways when a function is called. The two primary ways to pass parameters are by value and by reference.

2. Pass by Value:

   • When parameters are passed by value, the function receives a copy of the variable’s value. This means that any changes made to the parameter inside the function do not affect the original variable.

3. Pass by Reference:

   • In C, true pass by reference is not supported directly as in some other languages (e.g., C++). However, you can simulate pass by reference by passing the address of a variable (i.e., using pointers). This allows the function to modify the original variable's value.

4. Pass by Pointer:

   • This is a specific case of passing by reference where the address of the variable is passed to the function using pointers.

5. Analyzing the Given Options:

   • "Pass by reference" is not the default in C; you must explicitly use pointers to achieve this effect.
   • "Pass by value" is the default method for C function parameters since each parameter is copied into a local variable.
   • "All given options are correct" is not accurate due to how C handles parameter passing.

Summary of Findings:

Considering the explanations above, the correct answer is:

Final Answer: Pass by value.