Indicate appropriate brick and mortar selections for each of the following situations by mentioning the minimum brick strength grade, its appearance type and the necessary mortar type.

a. Little Rock, Arkansas: Exterior load bearing walls for a 17-story dormitory with a highly-regular and smooth appearance.
b. Palm Springs, California: Brick retaining wall with a very rough texture.
c. Winnipeg, Manitoba, Canada: Veneer wall inside a shopping mall, with a "hand-made brick" look.