What is the significance of the inverted triangles on the outputs of the device in the given figure?

• They represent inverters and mean that the outputs are active-LOW.
• They represent buffers and mean that the outputs can drive 40 TTL loads, instead of the normal 10.
• It means that the outputs will be active only if a change has occurred at that memory location since the last read/write cycle.
• The outputs are tristated.