Which of the following rolling contact bearings are able to absorb thrust forces at least from one side?

The correct answer is based on the ability of certain rolling contact bearings to absorb thrust forces from at least one side. In the context of rolling contact bearings, thrust forces refer to the axial loads that act parallel to the shaft.

Typically, certain types of rolling bearings, like angular contact ball bearings and certain configurations of tapered roller bearings, are designed to handle axial loads effectively. The specific bearings referenced in this question must include those that provide support for these thrust forces.

If a selection includes bearings a, c, and d as those capable of handling thrust loads, it indicates that each of these bearings is designed with a structure that allows them to manage axial forces either through their geometric design or the arrangement of their rolling elements. This characteristic is crucial in applications where axial loads are significant and need to be effectively supported, ensuring that the machinery operates smoothly without undue wear or failure.

In contrast, if certain other bearings listed are known for primarily radial load support and lack the necessary design to absorb thrust forces, they would not be included in the correct answer. Hence, bearings a, c, and d are specifically acknowledged for their thrust absorption capabilities, making this choice valid.