Classify each of the following sustainability key performance indicators $($KPIs$)$ according to the balance scorecard perspective it addresses. Choose fromt he five perspectives.

a$.$ Number of employees on sustainability teams

b$.$ Number of green products

c$.$ Cubic meters of natural gas usen for heating facilities

d$.$ Revenue from recycling packaging materiais

e$.$ Customer survey rating company's green reputation

f$.$ Percentage of products reclaimed after customer use

g$.$ Number of employee hours devoted to local volunteering

h$.$ Number of functions with environmental responsibilities

i$.$ Fotal liters of water used

j$.)$ Volume of Global Greenhouse Gas $($GHG$)$ emissions

k$.$ Number of sustainability training hours

l$.$ Total megawatt hours of electricity purchased

m$.$ Percent of bottles and cans soid recovered through company$-$supporied recovery programs

n$.$ Indirect greenhouse gas emissions from electricity purchased and consumed

o$.$ Percentage of profit donated to local schools

p$.$ Waste$-$disposal costs

q$.$ Charitable contributions as a percent of income