A spreadsheet display shows the following values in Row $1$ :

Cell A$2$ contains the formula $A$$$1^{{?}^{{?}^{?}}}2+$$$A1.$ The formula in Cell A$2$ is copied across in Row

$2$ with automatic cell referencing. The value in cell D$2$ will be:

a$.0$

b$.3$

c$.9$

d$.27$