What will be the output of the following code: a=(1,2,3,4); print(a)?

The output of the given code is indeed a tuple, specifically (1, 2, 3, 4). In Python, a tuple is defined using parentheses, and it is an immutable sequence type that can hold a collection of items. The way the variable a is assigned—by enclosing the numbers in parentheses—clearly designates it as a tuple.

When the print(a) statement is executed, it outputs the value of a, which is the tuple containing the integers 1, 2, 3, and 4. Therefore, the correct output is the representation of that tuple as it is displayed. This understanding of tuples in Python is foundational, emphasizing their syntax, properties, and how they are represented when printed.

The other choices reflect different data types that do not match the actual assignment and structure of a. A list uses square brackets, integers are whole numbers without any grouping symbols, and strings are sequences of characters usually enclosed in quotes. None of these fit the provided code snippet's output.