Which operator is also known as the insertion operator in C?

The insertion operator in C is known as "<<" in the context of input/output streams, particularly in the C++ language rather than plain C. However, in C++, the "<< operator is used to insert data into output streams, such as std::cout.

While C does not have a built-in insertion operator like C++, this association primarily exists due to the usage in C++. It's important to clarify terms accurately; however, in the context of programming languages where input/output streams are utilized, the "<<" operator is frequently referred to as the insertion operator due to its role in inserting values into streams.

The other options do not represent an insertion operator. For instance, the ">" operator is a comparison operator used to determine if one value is greater than another, the "+=" operator is an assignment operator used for adding and assigning a value to a variable, and the "==" operator is a comparison operator that checks for equality between two values. These operators serve distinctly different functions compared to the insertion operator.