Which one is correct to fit in this statement? "Although it is possible to realize data functions by raster graphics in a web application, there are some problems if we do this using the $\_\_\_\_\_\_\_\_\_\_\_$ method. It is di$$cult to update part of the image dynamically with raster graphics because the color data are associated with the individual pixels".

a$)$ conventional

b$)$ convolution

c$)$ conversational

d$)$ contention