Tierra Grata

About us?
We provide access to clean energy, water and safe sanitation to rural communities through decentralized, affordable and non-polluting solutions.
Users subscribe to our services and through an interest-free credit acquire the different solutions through monthly payments adjusted to their income.
We accompany the services with a social intervention program that aims to generate capacities within the communities. With our Guardians program, we establish a management committee that becomes the technical team in charge of monitoring and repairing the installed solutions, guaranteeing long-term sustainability.

^{Available in: https://tierragrata.org/en/about-us. Adapted.}

According to the text, it is correct to say that:

a) Tierra Grata offers free services for rural communities.
b) the cost of services offered by Tierra Grata are priced according to users’ income.
c) Tierra Grata users pay for the services on a yearly basis.
d) the Guardians establish the committee that selects users who subscribe for the program.
e) the payments users make each month are calculated according to their earnings.