Introduction:
In steel construction, connections play a crucial role in transferring loads from one structural member to another. The connection between a steel beam and a steel column is a critical joint that must be designed to effectively transfer loads and ensure the overall stability and integrity of the structure. There are several types of connections used in steel construction, each with its own advantages and limitations.

Framed Connection:
The correct answer to the given question is option 'C' - Framed connection. A framed connection refers to a type of connection where two structural members, such as a beam and a column, are connected together using various components to form a rigid frame. This connection provides stability and rigidity to the overall structure by allowing the transfer of forces between the members.

Stiffened Seat Connection:
A stiffened seat connection, on the other hand, is a type of connection where a steel beam is connected to a steel column using a seat angle that is stiffened with additional plates or angles. This additional stiffening helps to enhance the load-carrying capacity and rigidity of the connection.

Unstiffened Seat Connection:
An unstiffened seat connection is a type of connection where a steel beam is connected to a steel column using a seat angle without any additional stiffening. This type of connection is usually used for smaller loads and does not provide as much rigidity as a stiffened seat connection.

Rigid Connection:
A rigid connection refers to a connection that provides a high degree of stiffness and strength, allowing for the transfer of loads without significant rotation or movement. This type of connection is achieved by using welded or bolted connections with sufficient strength and stiffness. Rigid connections are commonly used in steel structures where stability and rigidity are critical, such as in multi-story buildings and bridges.

Conclusion:
In summary, the correct answer to the given question is option 'C' - Framed connection. This type of connection provides stability and rigidity to the overall structure by connecting a steel beam to a steel column using various components. Stiffened seat connections, unstiffened seat connections, and rigid connections are other types of connections used in steel construction, each with its own characteristics and applications.