Which features enhanced the illusionism of the ceiling painting Triumph of the Name of Jesus by Giovanni Battista Gaulli.

a. At the center of the vault the ceiling appears to open up offering a glimpse of Heaven. Jesus appears as his monogram (IHSS) in a burst of radiant light that appears to be floating upward.
b. To enhance the illusionistic qualities the artist glazed the architecture to suggest shadows.
c. His distinctive use of light and assertive brushwork.
d. He painted some of the sinners over stucco extensions to enhance the three-dimensional effect.